The standard for a Mary Sue character has gone way up too. The Japanese really figured out the formula with isikais where the protagonist is almost always good at everything or OP in some way, but the writing/world building is better. There are enough gems amongst the garbage that people know what a good one should contain now.
Actually the shooting at gay night clubs in the states are usually not white Christians. The most famous to me was the Pulse night club shooting by Omar Mateen, an Islamic extremist.
I think it’s safe to say that anyone attacking the LGBTQ community is a religious extremist of some variety though.