Saying he was “chosen” decades ago is a bit of a stretch although I can understand why you’d say that.
If you look at old Trump interviews you’ll see he’s not a total buffoon, in fact there’s even a clip while he was running where he admits to saying whatever he had to in order to win, e.g. how he started out against 20 opponents in the primaries and took them out one by one.
Then we have the revelations about how his team heavily relied on analytics firms such as “Cambridge Analytica” to target voters in the most effective way possible (think thousands of iterations a day on the same Facebook ad).
What I find more concerning is how nearly 63 million people voted for him, apart from whatever backroom shenanigans went down to win the Electoral College votes. Not that the alternative would have been any better.
Either way it’s as Dionysus says - Trump sows division, as do all politicians, with the difference that nothing is off the table since he can routinely lie, change his mind, blabber and enough people still cheer him on. In theory the press is supposed to keep politicians in line (at least in terms of public opinion) but from what we’ve seen they just don’t know how to handle someone that doesn’t care, uses schoolyard tactics and still has massive support.