They’re seeing him being as much of a liberal-exasperating outrageous asshole as he can be every single day. That’s what passes for “fighting for them” in the degraded state of conservative ideology these days.
American conservatives as a movement have basically given up on having any constructive goals. As I said a few months ago, they’re immensely frustrated that so many of the goals their leaders exhorted them to champion over the last few decades just ended up falling apart or not achieving anything for them:
More recently, they have added to those frustrations being wrong about the 2020 election being “stolen” from Trump, and about the January 6 insurrection being a patriotic act that would restore Trump to power, and about anti-government free-market individualism (as exemplified in Texas energy grid policies) not needing an adequate regulatory framework.
American conservatives over the last half-century or so haven’t been able to achieve or create anything significant (largely because they’ve been following politicians who had no meaningful governmental goals other than to expedite consolidation of wealth and power among their elite cronies). In fact, most of the significant achievements of that period, such as expansion of rights, social benefits, etc., have been things that conservatives started out strongly opposed to, even if they ended up accepting them more or less grudgingly.
The only thing they feel confident of being able to accomplish is being reactionary obstructionist assholes who piss off liberals. And Trump has been constantly presenting himself as a master of reactionary obstructionist liberal-pissing-off assholery, so that’s what they see as his “fighting for them”.
Of course, Trump despises them as “low-class” and “losers” and only plays up to their adulation for the money and popularity, but they don’t realize that.