Summing it up, Trumpers see them as "the boy who cried wolf", anti-Trumpers see them as Mulder's "I want to believe", and those in the middle see them as "where there's smoke, there's fire".
Trumpers are willing to dismiss all, thinking the prosecutions are political and desperately made by a thoroughly corrupt system. They think it's all coming from the same kind of sources that were behind the discredited Russian collusion hoax thing, like the alphabet agencies suggesting social media censor stuff that would help him, all that. You can see Trump's poll numbers spike after Bragg, as Republicans rallied to him in response. Their mistake is in thinking that his prosecution and innocence is as obvious (or will be) to everyone else and will act accordingly.
The middle will assume he must be guilty of at least some of the charges if there's this many, and if the charges are this varied, they can at least choose to focus on the one they find the most damaging. By and large, they won't find the Trumper's arguments convincing rather than conspiratorial. And the anti-Trump people ain't ever gonna be reached.
Polling between the two major candidates are essentially 50/50 rn, but that ain't gonna stay. Republicans thinking these indictments will help him rather than hurt in the general are delusional. I say that as someone relatively uninvested... If it's Trump v. Biden redux, I'd even take the nut job RFK, Afroman, or average LP candidate over either of them. Most of the charges are bullshit, but not all. And both Trump and Biden are guilty of far worse in office than what he's accused of in the courts.