Talking about "converts" applies to everyone, Hindus too were converted to Hinduism some how!
So, most your arguments are a little bit biased, to say the least.
Muslims were extremely successful for a 1000 years, so they do have a unique experience of success on their own (Too many cultures to enumerate here), while opening up and tolerating other faiths and mentalities.
Experience from history indicates to the Muslims today to be more careful and prudent about how much they should be open to others and till what extent, while tolerance of other faiths is not touched.
What happened in India during the Islamic invasions seems to be very exagerated, unless the Indians were very or extremely barbaric, I do not see any other reason why it happened that way-If it happened at all-, since there is no other record of such atrocities in the history of Muslim "invasions" of other places and other people.