Right…
Take a look at this: https://en.wikipedia.org/wiki/History_of_violence_against_LGBTQ_people_in_the_United_States
Note how almost every one of these horrible things lead to a conviction of the perpetrator. So tell me, if the police and judiciary system in general does not protect you, who investigated these cases and how did the convictions happen?
What do you think would happen to violence like this if there was no police and hence no way to get caught? Do you think it would decrease or increase?
It might be important to ask what causes people to lack empathy. Currently there seems to be a rather unscientific line of thought at least in social media that some people are just intrinsically evil.