He was the one who raped Billy Butcher's wife Becca and impregnated her with a son named Ryan.
To protect a secret, he destroyed the jet of the Mayor of Baltimore and killed him along with his kid.
He let the entire transatlantic flight with passengers to crash and even didn't bother to help.
Homelander in a fit of rage almost killed an entire crowd, only when he realized it was a dream.
Homelander killed a potential member of the Seven 'Blindspot' just because he was BLIND.
Homelander while trying to prevent a girl from suicide, ultimately forced her to commit it.
In the Season 3 finale, he blatantly kills his trusted ally 'Black Noir' for hiding a secret.