The only thing that makes an evil “lesser” is that there is less energy going towards supporting it. By putting it into power you make it the greater evil.
this just seems categorically untrue, unless you think that there are no meaningful differences in outcomes even between "lesser evils" and "greater evils" (in which case i would argue your distinction does not exist here and therefore is not useful for the purposes of this argument). the idea that energy and power alone/even primarily determine "evil" in this context also seems deeply reductive--just because Nick Fuentes, for example, is not at serious risk of running the country does not mean his ideas are a lesser evil to the regular liberalism currently in power and only become a greater evil once he is.