Remember that even less than "circumstantial evidence" is what fuels 90% of Trump's bold assertions. And they lap it up. Even now they are trying to make this about Bill Clinton! (Can you imagine what would have happened if Clinton was Epstein's friend but Trump wasn't? Or if Hillary was in some photos? I can guarantee there'd be no redactions at all).
So now MAGA voters cannot complain when Trump is the target of unconfirmed rumors.
And indeed, even a portion of MAGA is susceptible to this particular scandal: Epstein. They had a minor falling out with their leader over this!
I do agree attacking all of MAGA is a counterproductive tactic though, because it puts them on the defensive. Mounting evidence against Trump without attacking his voters is more sensible.
1) There is 0 non circumstantial evidence that Trump had a sexual encounter with a minor. There is 0 evidence (circumstantial or not) that there is any prepubescent children involved.
2) Calling anyone who voted (past tense) for Trump a "pedophile supporter".
Combining these two things togtheter seems pretty obvious why Maga supporters dismiss most of what the public outrage, in fact they will dig their heels in even harder since the "other side" is just attacking them personally.