There are stupid people in all walks of life. Look at any cult, Scientology for example, and you'll see lots of people who seem "smart" and have respected professions. It doesn't mean anything. Trump is like the used car salesman who sells you the same used car twice and you're too stupid to catch on to the con.
Did Trump bring back all the manufacturing jobs the last time he was president? No. But hey, I'm sure he'll do it this time around. And if he doesn't, I'm sure he will convince all your plumbers, electricians, police officers, car mechanics, construction workers, etc. that he'll do it, but he needs a third term in office. And you know what, all those people who voted for him twice already would actually believe that and would support amending the constitution just for that purpose!
What gets me about the level of voter stupidity is that people will vote against their own self interests. Republican politicians only ever want to give huge tax cuts to the richest people, because they've been running this 50 year old "trickle down economy" con that's been working so well for them.
Apparently you have to give billionaires as much money as possible, because they'll open new manufacturing plants, create new jobs, and give the average working higher wages. The first time Trump was in office he gave the rich a trillion dollar tax cut in his first six months in office. Did they use that money to help the average worker? Of course not. They used it for CEO bonuses, stock buybacks, and buying a second yacht.