The point of this is that there are always ways to deal with aggressive bullying individuals and since for the most part they threaten terrible consequences, then it is a language which they understand and must needs be used against them. If just one Republican candidate all those years ago on the debate stage really went after Trump hard, this could all have been avoided. But they just stood there smiling while he insulted them, their wives, their parents, and their heritages. It would have taken just one of them to go on a vituperative rant, and he would have been smacked like a fly by a flyswatter. Too little, too late now.
Republican voters chose Trump over those other candidates because they were tired of do-nothing Republicans who talk a good game on conservative policy, but are generally ineffectual politicians. Their non-response to being insulted by Trump is reflected in how they react when insulted by Democrats. How much ground have Democrats gained simply because Republicans wouldn't oppose them wholheartedly?
Indeed, we may not have had a President Trump today if the other mainstream Republicans had shown that they have spine. But that's because there wouldn't have been a need for him.