Your comparing 1 movie to a 5 season series
Let's go into depth talking about the most evil thing these characters have done starting with.
joker Point 1
Heath ledgers joker rigged 2 boats one filled with civilians and the other with prison inmates giving each boat the detonator for the others boats.
Meaning the civilians could to choose to blow up the inmates boats to save their own lives
Point 2
Corrupting Harvey dent
Turning Harvey dent who was seen as Gotham's hero
And turning him into a murderer and breaking his morality by jokers manipulation
Going on to Antony starrs homelander
Point 1
Flight 37
Terrorist hijacked a plane during the fight
Homelander shoots the pilot controls resulting in the plane staring to go down resulting in 123 people dying as there were 2 ways he could have saved them the harder way going under the plane and trying to lift it to safety and the easier way taking 3 passengers at a time down to the water/land 3x41=123 3 passengers at a time 41 times and everyone would have survived even if he didn't save all of them it would have reduced death.
Point 2
Forcing the deep to eat his friend Timothy alive the octopus even after the octopus begs for his life
could name a few more for homelander.
I can't name anymore for the joker