It's not intelligent to state that comic books are "left wing" and always have been. Nor would it be intelligent to state that they are "right wing". Comics are an art form. Art is subjective. What a leftist ANTIFA member and conservative Trump supporter get from reading a comic might be different and it's possible that neither one gets the point of the writer. I don't have to cherry pick to support my opinion. I've read comics since age 4 and have literally thousands stored away.
People like to take something of value and attribute their ideals to it. Hence, why shitty writers take existing characters and make them gay, an impotent failure, or race swap and give the mantle to a minority instead of putting in work and creating a well-written gay or minority character if that's what you hope to represent or have as a hero against "the other side". This thread starts with the premise "These characters are from my side!" which is more of someone taking a work and claiming it as theirs for some silly reason.
To think that Captain America, a character who loves his country, served in its army, and admittedly prays and respects God is "left wing" for some reason is hilarious. He was created by deeply religious Jewish men. If you want to say he's a classic Liberal, respecting the rights of all humans then I can agree with that. Todays leftists aren't liberal, they don't respect the rights and speech of others. Captain America, Superman, Batman, Wonder Woman, Luke Cage, etc wouldn't hit someone for wearing a MAGA hat. They wouldn't try to shut down opposing views on College Campuses.