Salafism doesn't allow for any of that, not any more than the rest of the sects. Calling others Kaffir? Barelvis, Shias, Ahmadis and most other sects do that too, alot. It's about individuals. Sick individuals are sick and they will twist any ideology to make it sick.
Nazism (kind of) used to be National Socialism - not that bad of an ideology. But Hitler turned it into a racist and destructive ideology. The same applies here.
I've seen plenty of Barelvi imams call Saudis or Deobandis or Salafis (What they call 'Wahabis') kaffir. Yet some of my best friends are Barelvis. Its about Individuals, individuals who twist ideologies. An ideology is nothing without its followers. An ideology didn't kill a hundred children today - individuals did.
Well, you can go on and believe that. But the evidence on the ground contradicts you. 99% of all these scumbags whether in West, East or in the middle belong to the 2 ideologies: A) Najd of Saudi Arabia and B) Deoband of India.
If you could show us that equal numbers of these scumbags were following other sects and religions, then your argument would be convincing. But unfortunately we know that Brelvis, Shias, Ahmadis, Budhists, etc etc are not blowing themselves up every where, holding up black&white flags.
Nazism is actually was an amalgamation of extremists Christianity and a politico-economical system. Takfirism is not any more different. It is an extremist Islamic ideology combined with a promise of a Utopian politico-economic system for its followers once they have killed all those who are not following their ideology.
The difference between Brelvis who call and what Salafis call, is huge. One goes and eats his roti at home and sleeps with his wife and the other goes and forms crazy militant outfits bent on killing soldiers, civilians, women and children without mercy.
As I said, there were very nice and even agreeable Nazi citizen in Hitler's German but the ideology was the culprit. Here it is no different. Unless the ideology is not tackled the way it was tackled in Post War Germany, Pakistan will continue to suffer, no matter how much Pakistan invests in its Army and Intel services. The core of this problem facing Pakistan is a violent ideology. You can not fight an ideology with security measures and brute force alone. You must uproot the ideology feeding it.
Here is a question for you: Have Pakistani Deobandi/Takfiri mullahs come out and unequivocally and unconditionally condemned this attack, and its perpetrators without making excuses on their behalf? Have they demanded for the perpetrators be brought before the law and punished to the maximum extent possible?
I thought so.