Comment: I don't think that it is certain that Trump was elected because of the Russians.  I do think that a large reason he was elected is exactly because of this type of behavior.  There is a subset of our population who seems to think that this type of behavior is good.  For the most part, they are people who haven't had good role models in life.  They work for managers who are just bad, prior to that the only role models they had were gym teachers or sports coaches, so they grew up believing that this is the way to behave.  Normal politicians don't act this way and it bothers them, since they don't see normal politicians as people who behave in what they think is normal.  

tl;dr
In short, they like bullies, they think that bullies are somehow actually good leaders.