At this point there are only 4 possible explanations for Trump's consistent fuck ups.
Best case scenario but unlikely
>The gaffes are all part of a grand strategy in which Trump plans on rolling out a much more palatable and presidential demeanor closer to the election. However, Trump is simply unable, whether by choice or by genetics, to behave in a manner that is viewed as traditionally presidential. Thus, it was necessary for him to act so ridiculously unpresidential in order to make his best possible face seem as refined and sophisticated as possible in comparison. In order for this scenario to possible, Trump will have to start turning things around immediately. If he reaches any lower in the polls his campaign will probably dissolve.
Bad but likely
>Trump still thinks the strategy he used to win the primaries, creating as much controversy as possible, will be just as successful in the general.
Awful but less likely
>He legitimately has a problem wherein he can't help but attack someone personally when they criticize him even when doing so will severely damage his image and poll numbers
Worst case scenario but unlikely
>Wants to lose the election
There are simply no other explanations. I've been a Trump supporter since October after Jim Webb dropped out and will still vote for Trump over Hillary any day, but goddamn he's making it difficult to defend his actions and to convince undecided people to vote for him.
Trump needs to channel pic related if he wants to win this election.