From my POV Jack Kirby was a reactionary, imperialist hawk with PTSD but a very good heart, and Stan Lee is a bourgeois piece of shit. I'd describe Tezuka as much more liberal than Jack Kirby.
I don't see it as "sides" and certainly not as "both" sides. It's definitely not a gradient. These are competing political philosophies, and they are much more like animals than equations. There are thousands of animals, and they do not cancel each other out.
I do agree with Kundera that what unites "liberalism" and "leftism" is "the kitch of the Grand March." I do not see that as a bad thing -- all movements generate kitsch, and more importantly it points toward what I suspect to be the real fundamental division:
"liberals" believe that things are getting better and therefore we need to get them better faster. "conservatives" believe that things are getting worse and therefore we need to protect what we have.
IMO foolishly narrow definitions of "we" are the main problem facing the world.