I don't believe he's guilty of these alleged crimes until he's tried for them in a court of law, which is unlikely to happen (or perhaps even impossible due to limitations that I believe apply in US law). On the other hand I don't think it's right to suppress them given the context. Here's a man who is running for president, in part with a promise to throw his opposing candidate in jail for her own alleged crimes -- which, it should be noted, have been heavily investigated with no criminal proceedings resulting -- and who was recorded on tape boasting about how he happily "grabs [women] by the pussy" whenever he feels like it. His defence to this was that it was all talk, or normal banter. Well, in that case, these allegations are entirely relevant because they go against that line of defence.
And since the women involved (if their allegations are true) may well have no option in law, where else can they go? Or should they be obliged to be silent because how dare they speak out about things that happened to them?
Yes it could be lies, and it's difficult to know how to respond in that case, but the possibility that these separate allegations could be true demands at least some attention.