If I build my opinion on the US based on news reports of School shoot-outs, even if those reports are credible you think my perception of US would be accurate?
No, but that's small comfort if you happen to be the parent of one of the American kids killed in the shooting, or to an Indian Christian college student whose family has been murdered by a mob because of his religious affiliation.
Incidents such as that one are probably very uncommon in India just as school massacres are very rare in the US. But the mere fact that something like that can and occasionally does happen is enough to show the Hindu majority in a bad light. European Christians used to persecute and murder Jews and other non-Christians too, but they gave up that practice a couple of centuries ago and Christians now rightly condemn that awful practice. It's time that Indian Hindus condemn violent persecution of non-Hindus even if it only happens very rarely.
According to reports by Christian missionaries in India who serve there with the same mission org that my daughter serves with elsewhere, the desperately poor Dalits are converting to Christianity on a very large scale, and I imagine that situation is an irritating burr under the saddle for some Hindus.