He did nothing to stop it either. It does get to a point where you know you are highly likely to be killing someone and continue anyway- that it is no longer unintentional. It may not have been the original aim, but he had plenty of time (and advice) to change his mind. This wasn't a one-off impulsive action, but a sustained act where he knew he was at least doing serious damage.
If he was genuinely unaware at every point and every minute, then his sheer ignorance and stupidity would be enough to at least keep him away from any kind of authority. Whether he is arrogant, evil, a bully, vindictive, racist or just a total brain donor... he's dangerous.