I think there's validity to this, and I often catch myself thinking exactly what was posted - these people would rather see kids molested or innocents blown up in a town square than risk hurting someone's feelings - that ultimately they just don't care when it's not them. And maybe there are some, but I agree that most don't have that view. (Although most of them will happily apply the "if it saves one life" fallacy when it suits them in other contexts.)
The reality in some ways is more dangerous: they just don't see a connection. Seattle is on here excusing this by saying "well men are gonna creep into women's bathrooms anyway." I read a post after the London attack where someone basically ripped westerners for hypocrisy about "condoning" violence toward women and minorities every day (not sure when all that became legal and acceptable on any scale in the U.S., but whatever...) and freaking out "just because one a**hole decides to act out." The idea being "hey - there's one at every party! Some people are just jerks, and someone's always going to be committing some random act of terrorism."
This idea that the tragedies and attacks against helpless people are just "the cost of doing business" in our society is becoming more and more common among progressives. And in reality, those situations give them a chance to really shine - no one does tragedy and empathy like a leftist. They can have their memorials, cry on each others' shoulders, bemoan the evil of the world and vow that WE WILL NOT LET EVIL WIN (whatever that means.) And then they go right back to enabling those behaviors because they're good people and their cause is right, and any issues should be blamed not on the enabling policies, but on the Evil People that we're fighting against - which is usually not the people who actually committed the crime in question.