This is not how the films portray it, not at all.
It's exactly how the films portrayed it. Anakin fell to the Dark Side because he wanted the power to save Padme. Count Dooku fell to the Dark Side because he lost his faith in the Republic and the Jedi Order to truly bring peace to the galaxy. The only character who is ever considered outright "evil" is Darth Sidious, and his motivations and rationale for what he does is never explained.
The Dark Side isn't about just stomping kittens. That's a very superficial and childish understanding of how the Force works. If it was that basic, nobody would ever fall to the Dark Side to start. It's much more nuanced than that and I encourage you to rewatch the films, do research on Star Wars wiki, and learn more about how the Dark Side and Light Side work in unison.