why do yall draw the line at...

I'll never understand why the line is drawn at rape or pedophilia. Like i've seen ppl constantly thirst over serial killers but find out they're a rapist or pedophile and it's now a problem. They're both problematic so why is the same energy never kept for killers. I've also wondered why so many people would say some shit like kill all pedos without looking into the situation. Shit like that annoys me bc it's obvious they're not educated on the subject. So i just wanna know yall opinions on people that suffer from pedophilia and where the line is drawn at and shit.