What is a sign someone aint a good person thought they act like they are?

i wish people had great big warning lights above their head that said in bold letters : [b]"WARNING - DICKHEAD APPROACHING"[/b] lol but there are subtle behaviors that indicate if a person is dangerous. for example if they grab someone by the pussy, mock a disabled reporter, tear a child from their parents arms, pay off a pornstar, insult a gold star family, call nazis “fine people”, deny science, steal from charity, and, start a fake university 🤔 that person is likely a complete asshole