First, you're assuming that Trump had sex with Stormy Daniels. Maybe he did, maybe he didn't, but it is very difficult to differentiate between 'please go away with your bullshit because it is distracting' agreement, and a 'here is some money so you don't talk' agreement. If you have special insight into this matter that has not been reported on, please do share it.
Second, you're saying he is 'completely devoid of ethics and morals' because he allegedly cheated on his wife when she was pregnant. Has no one with morals or ethics ever cheated on their wife? Do you lose your ethics and morals by cheating on your wife, or are they just never there?
Finally, let's assume this did happen. Do you know the relationship status of Donald and Melania? What if they both agreed to have a sexually open marriage before they got married? It wouldn't be too out of left field - Trump was a known playboy.