"Okay, let's see a reliable source that says so"
Pick any mainstream news source. Wait a day or two after the initial news has gone out. Find an article about it and read it all the way to the end. That's what I did. Every time a school shooting happens the guy turns out to be a far left radical. Every time!
Is that reliable enough for you?
"Patrick Wood Crusius
John Timothy Earnest
Robert Gregory Bowers
Frazier Glenn Miller Jr"
Who are they and what makes them conservative? Are they conservative just because you say they are conservative? I am guessing these guys must be Neo-Nazis in order for you to call them conservatives. Modern conservatism is the polar opposite of Nazism. Nazis and Neo-Nazis have much more in common with the Democrat party. And no, I do not mean the radical leftists, I mean the mainstream Democrat party. Go find the Nazi Party platform online and read it. Take the word Germany out of it and it reads almost identical to the Democrat party platform.
"Like the conservative Christian who blew up the 16th Street Baptist Church in 1963, killing four young girls? Or the conservative who shot up the church in Charleston in 2015, killing nine people?"
1963???? Again what made that guy a conservative? What made the Charleston church shooter a conservative? Are you saying white supremacy equals conservatism? If you are then you are not just an idiot, you are a blithering idiot. But that's what you get when all you do is turn on the TV and believe everything they tell you without finding out for yourself.
What you really need to do, and this is imperative, is find out what and why conservatives, actual conservatives, believe. Talk to them, without being arrogant or condescending. I'll tell you right now I know a whole lot of conservatives and not one single one of them, including myself, is any kind of a supremacist, white, brown, black, purple, green or whatever. We do not hate people who (as the left so frequently accuses us) "look different than us". Skin color is just an external feature, just like eye color and hair color. It is no more ridiculous to hate people because of the color of their skin then it is to hate because of the color of their eyes.
The problem is we disagree with nearly everything the left believes because the left is on a self-destruct course. So in retaliation you call us everything you can think of (which isn't much) and you do it so much that you actually believe it.