Trump brought us into an era where nothing you say matters anymore in politics. To think it wasn't all that long ago when politicians were practically lynched for "flip flopping" on an issue.
What you say matters, but pandering to your base and bullying in a charismatic way matter more. It's kind of a life lesson. Certain words can speak louder than action. Obama did this too but in a much more classy way inspiring hope. But he didn't really continue it much as president, where as trump is a daily propaganda machine
Being hypocritical DOESNT matter though. Because when you think about it, only nerds or lawyer minded individuals actually fact check or remember past statements. As long as you assert yourself strong in whatever you say now.... that's what counts.
However ,you also assert repeatedly when the opposition is being hypocritical, to fire up your base. Even though people may not remember it, they will believe it and eventually accept it if told long enough. Most people are pretty simple minded when you get down to it