It's interesting to note how many people have these kinds of personal scandals, especially sex abuse scandals, be a radicalizing moment where they pivot hard into right wing politics and whatnot. Whether it's sex pests getting "me too'd" or other generic "cancel culture" nonsense, personal and professional failure seems an express lane to right wing radicalization for so many.
Right wingers are so hungry for high profile personalities on their side, especially those from the entertainment industry which is generally seen as dominated by liberalism, that they are more than willing to overlook bad behavior and vigorously defend their own. The right wing base never gets tired of the "I used to be a liberal, but now I'm a frothing at the mouth reactionary" routine. There's nothing these freaks love more than an aggrieved, embittered personality doubling down on anti-social tendencies in the highest possible profile. Hard to say how much of this is purely cynical and how much of this is more "community of last resort" for people who find themselves unwelcome in more decent company, but the right wing leper colony is always accepting new members.
In this case I wonder if Brand could see the writing on the wall regarding his past behavior and decided years ago to be proactive by building up a right wing fanbase that we see circling the wagons around him today. There was certainly a quite pronounced pivot for him, like you point out.
If you're a sex pest it's extremely clear what side of the partisan divide is more willing to not only overlook, but stridently defend their own.