Does systemic racism exist in the US?
Hitler killed the jews because they were socialists and he believed they began socialism. Because of this, to him he was stopping the rise of communism and the killing of all smart Germans like what happened in Russia. You can see it to this day with how the IQ in those countries is several points lower than in places that never suffered communism.
They were lynched because they did a crime and the mob was angry about it, not unlike BLM today. With them though they stopped once the wrong-doing was dealt with but with BLM 3 months after the police officers were charged they continue rioting.
It says on your profile that you describe yourself as a "non-player gamer". You seem to be an NPC as well.
I think people can but I wouldn't consider it "racism" just being an asshole or playing favorites. That or they are hiring the best person for the job unlike how it may appear. Companies hire close to evenly anyway on average for whites and blacks. If you have no criminal-record then there are slightly better odds if you are white but with a criminal record it's slightly better to be black. For violence, they probably do have hatred in their heart and it's unfortunate that they were influenced and/or born that way. Could be also motivated by different things or even be one of those "hate crime hoaxes".