I agree with your example and other examples mentioned by other posters. However, there are less obvious examples of "touching" that could just be an attempt to engage. Few people would choose to ask formally if it would be "okay to touch your arm" for example.

New relationships start somewhere. Always have and always will.
 
The line Weinstein crossed on the other hand is obvious to everyone. His predatory use of power over frequently desperate young women is both criminal and disgusting.

What we should hope for is that people in positions of power are less inclined to cross the line and that those that do will be dealt with appropriately.