And yet he is leading. Must be a great mystery for you.
No mystery at all.
Trump has a cadre of very dedicated supporters who Trump himself said would probably keep supporting him even if he killed someone in the street. I don't expect those people to turn on him no matter what he says.
So while his fan base loves it, nobody else does. And that fanbase is not enough to win a majority in November, even if it is enough to win a plurality now.