Voldemort seems obsessed with himself, wanting power and escaping death. He wants to be the most knowledgeable, most powerful, most immortal, wizard to ever be. He is also a psychopath. He does not seem to be like Grindelwald in his motivations, but then ends up using the means that seem appropriate for Grindelwalds motivation. Contrary to how Grindelwald is portrayed in the books, people are simply tools for Voldemort. His world domination trip seems counter-productive or at least somewhat orthogonal to his other goals.
Why does he go on a world domination trip, recruit followers, etc. when what I think what his motivation is could simply be achieved by locking himself in an ivory tower?