Whatever your personal definition of heinous is, the actions of fictional characters don't imply anything about what is ok in the real world, or even in the fictional one those characters exist in, when taken out of context.
If you have difficulty separating fantasy from reality, you are free to refrain from indulging in fantasy material.
In the case of Amos Burton/Timmy, given how much of a badass the character is, I don't think those cops will fare too well when they come to collect Peaches/Clarissa Mao (one of the the 'wrongest chicks' I can think of, and even more of a badass) for escaping from prison and Burton for helping her.
If you mean Wes Chatham, the actor who plays Amos Burton the character, then yes, he could conceivably go out with the 'wrong chick' and face allegations of something he did not do, possibly having to make statements to law enforcement, and perhaps even be investigated. If it's a one-off thing and there is no real evidence against him, the allegations would almost certainly not result in any significant personal or legal trouble for Chatham, but could very well result in a slander settlement against his hypothetical accuser.
Having many people come forward with credible accusations of harassment and assault is rather less likely if there was no wrongdoing, which is why the studio saw fit to end their relationship with Cas Anvar. Maybe he's innocent, maybe not, but a pattern of such accusations is not something the studio felt they could just ignore. Should he be exonerated, surely he'll be able to seek, and probably receive, compensation.
Sure.
I don't really want to descend into a game of whataboutery, but you're talking about a show where people are casually killed all the time, where children have been abducted and turned into literal monsters, where some of the antagonists and even protagonists are mass murderers...but the 'heinous' acts that stand out to you are: an entirely consensual sexual encounter; and a justifiably upset young murderer, who has been manipulated by his mass-murderer father into being even more conflicted than he should be about his accessory-to-mass-murder mother abandoned him, backhanding her?
Well, if that's what offends you, again, you're free to not watch it.