My wife told me about a time she brushed off some guy hitting on her in a club, so he pushed her against a wall and groped her breasts and slobbered over her face and neck, with his bunch of mates standing around to reduce everyone's sight. She shouted and struggled, for all the good it did her. (Needless to say, no-one intervened.) This is what some people do. This is what happens in the world out there.
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At core, you are making a lot of completely arbitrary assumptions about Trump.
What makes you assume Trump thought she didn't want it? Trump might believe her assent to shop with her was also an implicit invitation to more, or Trump might to some extent think himself such hot property that he just assumes women want a piece of him. Have you considered that Trump might have very different risk assessment? He has compulsions - including thinking with his dick - and just went for it, or that maybe Trump has done this before and always got away with it, and so has learnt that he can get away with it and there is minimal risk?
I say this to make the point that your arguments here are not actually based on a real Trump. It's a fictional Trump you have made up to explain a conclusion for why he couldn't have assaulted someone. You are simply not thinking about all sorts of real-life behaviours that real people have (and which are not even that rare), and refusing to accept that any of them might apply to Trump. Even when Trump says that he can just grab women by the pussy, you still refuse to entertain the fact he might actually act like that.