The reason I kill every random I see (most of the time) is because I hate randoms. I hate how they drive, I hate how they glitch and try to cheat, I hate how they behave on mic. I just hate them. My first experiences with multiplayer was in GTAO and my first experiences turned me from friendly to a killer.
In RDRO the game seems to be a little more peaceful. Yet whenever I of all people am acting peaceful and minding my own business some shitty random who can't kill anyone legitimately in battle tries to get a cheap kill on me. I was minding my own business on a nice selling streak of perfect Valentine sheep and this douchebag killed me even when I did not pull a weapon. So I killed him a bunch. This is why I am a dick to randoms.