As always with Trump, the question is with whom a particular event makes him stronger, his base or his base and a broader electorate? Kavanaugh juiced up Republican turnout and they still got absolutely crushed in 2018 with relatively favorable economic fundamentals/no foreign crisis. Why? Because he and his party's brand were absolutely toxic among vast swaths of the electorate who weren’t part of the base.
I agree that the indictments have made a good chunk of his supporters even more enthusiastic, but there’s absolutely no evidence it’s made him stronger in a general election.
Yes, Trump's base is vocal; it’s really, really loud, it’s super-passionate, but for the umpteenth time — it’s not even close to a plurality of the American electorate. An unenthusiastic Biden vote counts just as much as an enthusiastic Trump vote.
We know Trump's supporters do not make up the majority of the electorate, but as we saw in 2020, Trump can still come extremely close to winning the EC even when losing the popular vote by as much as he did.
All it takes is a few thousand votes to shift in GA, PA, WI, AZ, etc. for another 4 years of chaos.