Ok, number 1, he hasn't really done so yet. This is the guy who says he has nothing to ask forgiveness for.
Number 2, at this point, he couldn't be much more outrageous or say anything worse that would disqualify him from having the whatever to be the president.
Number 3, to ask him to apologize is saying, "Maybe he really didn't mean it." Good grief, of course he means it! It may not make sense and it may be totally unacceptable, but he means it!
Someone wrote on a comments board, "We have 330 million people in this country, and this is what we end up with to choose between for president?" That just about wraps it up. Only the most outrageous and unlikable are eligible, I guess.
P.S. Please don't take my Trump comments as endorsement of anyone else!