I am by no means defending what he said, but it would be unrealistic to expect a president to be all his life, even before he decided to be president, to be a flawless human.
I mean I understand some presidents having a mistress/alcohol abuse to a degree. But the fact the current president of America is open about being a pervert and sexually assaulting people "You know I'm automatically attracted to beautiful - I just start kissing them". The guys a hedonistic glutton, I have no idea why the Religious right voted for that animal.
I mean seriously, it's acceptable to have smoked pot or drunk to much or what not, because a lot of people have done that. It's not acceptable to be pervert that randomly kisses people and think touching peoples genitals out of the blue is appropriate, since I don't know a single person, and most people I would assume don't know any one like that. But have probably chilled a with a dude that smoked pot in university/gets to hammered on the weekend.
TLDR
Drugs/Alcohol = normal fuck ups.
Sexual assault/being a pervert = WTF by any civilized society.