Because he's the president, and I'm one of the idiots who lives here.
That, and I think he's okay. He's been fairly progressive in his approach socially, which is fine. I don't care if you wanna be a transgender throuple defending your international cocaine distribution center with RPGs. It's not my problem. I'm socially pretty conservative, but that's my problem, not someone else's. I'll live my life my way; you'll live it your way.
He's been fine economically, I guess. Job creation has been going well, and he seems interested in reducing needless financial burdens on the middle class. Gas is kinda expensive right now. I'm not so sure he affects that very much, though.
And he seems to have an at least basic understanding of using data to drive decision-making, like promoting gender-affirming healthcare because the scientific and medical literature suggests it as a form of treatment with beneficial outcomes for folks with gender dysphoria, or promoting vaccines because they're perfectly fine and do protect against diseases. Cool.
Will I vote for him (again)? Probably. I wish he wasn't such an old fuck, but you can't get everything you want.