You can't ignore the COMMAND of the Quran, with the example of the Khalifa.
Why is this Shariat? What Islamic qualifications do militants, ghundas and uneducated tribal people have? As you will see in the coming days this would turn into tribal law rather than Islamic law. The only adal would happen would be on women. Like every imposition of Shariat by extremists around the world, this would be no different, or only worse, this is a women's oppression Nizam. All of their Islam would start and end upon laying restrictions on women.
Of course you cannot ignore the command of Quran. Whatever Hazrat Abu Bakar did was in accordance with Quran and Hadith.
Following are few verses in Quran on the obligatory nature of Zakat":
[2:43] You shall observe the Contact Prayers (Salat) and give the obligatory charity (Zakat), and bow down with those who bow down.
[2:110] You shall observe the Contact Prayers (Salat) and give the obligatory charity (Zakat). Any good you send forth on behalf of your souls, you will find it at Allah. Allah is seer of everything you do.
[2:267] O you who believe, you shall give to charity from the good things you earn, and from what we have produced for you from the earth. Do not pick out the bad therein to give away, when you yourselves do not accept it unless your eyes are closed. You should know that Allah is Rich, Praiseworthy.
Following are also the commands of Allah on committing Zina:
[Noor 24:1] This is a surah which We have sent down and decreed its commands, and in which We have sent down clear verses, in order that you may ponder.
[Noor 24:2] The adulteress and the adulterer - punish each one of them with a hundred lashes; and may you not have pity on them in the religion to Allah, if you believe in Allah and the Last Day; and a group of believers must witness their punishment.
[Noor 24:4] And those who accuse chaste women and do not bring four witnesses to testify - punish them with eighty lashes and do not ever accept their testimony; and it is they who are the wicked.
[Noor 24:23] Indeed those who accuse the innocent virtuous, believing women – upon them is a curse in this world and in the Hereafter; and for them is a terrible punishment.
Some verses on Riba (Interest):
275. Those who eat Ribâ (usury) will not stand (on the Day of Resurrection) except like the standing of a person beaten by Shaitân (Satan) leading him to insanity. That is because they say: "Trading is only like Ribâ (usury)," whereas Allâh has permitted trading and forbidden Ribâ (usury). So whosoever receives an admonition from his Lord and stops eating Ribâ (usury) shall not be punished for the past; his case is for Allâh (to judge); but whoever returns [to Ribâ (usury)], such are the dwellers of the Fire - they will abide therein.
276. Allâh will destroy Ribâ (usury) and will give increase for Sadaqât (deeds of charity, alms, etc.) And Allâh likes not the disbelievers, sinners.
279. And if you do not do it, then take a notice of war from Allâh and His Messenger but if you repent, you shall have your capital sums. Deal not unjustly (by asking more than your capital sums), and you shall not be dealt with unjustly (by receiving less than your capital sums).
OK, you dont believe in Khalifas (Naaoz Billah) fine, but above are the words of Quran. And these words form the basis of the Shariya along with Hadith. But from your post, I guess you also dont believe in Hadith, hence I quoted none.
What Islamic qualifications do the common Pakistanis have? What they know about Islam? How many of us know Arabic, and have read and understood Quran? How many of us have read Quran with translation? How many of us have read the Hadith books, what about Fiqah? You can call those tribesman whatever you like to, but frankly are we as a whole any better than they are? If their understanding is rudimentary, ours is as well. They are on one extreme, we are on the other.
Do we not mistreat women? Of course we do. What would be the biggest mistreatment than to ask our women to leave the protection of their homes and do jobs? What the man of the house is supposed to do, we ask our women to do that. Making them expose themselves on commercials, TV and film for little money, is this not a mistreatment? What good has come out from making them work like men? Just see what west has achieved in the name of liberalism. The teen age girls are getting pregnant, as result of extra-marital relationships. Who is going to take care of them and their kids? Is this not oppression? They are made to dance naked in pubs, Is this not oppression? Men use them for some time, and throw them like used toilet paper, Is this not oppression?
Go to this website and read how well women are treated in your so-called civilised and Shariyat-free western world:
Soaring Rates of Rape and Violence Against Women 2008: Human Right Watch
http://www.hrw.org/en/news/2008/12/18/us-soaring-rates-rape-and-violence-against-women
and
http://www.now.org/issues/violence/stats.html
You find all the oppression in Islam and Shariyat?