The MCU Avengers haven't always made the right choices, but they barely hold a candle to the worst things the Avengers have done in the comics. Comics are a serialized medium where the ultimate goal is to get the reader to pick up the next issue. After 80 years of cliffhangers and wild choices, it results in a universe where all the characters have done some pretty wild things to keep readers interested - things that would never happen in the MCU.
The Marvel villains are pretty evil, but honestly, the heroes give them a run for their money at times. Whether it's angrily striking down a loved one or altering all of reality to meet your selfish goals, heroes aren't always so heroic.
Look, it wasn't Captain America's fault, but that doesn't change the fact that a version of Steve Rogers helped Hydra take over the United States in Secret Empire. Rogers used a group of fake strikes on Earth to trap the other heroes on either Manhattan or out in space. Rogers then tainted the water supply with substances that increased receptiveness, and he put the Inhumans in detention facilities.
As it turned out, Captain America's life story had been changed through the Red Skull's use of the Cosmic Cube. Still, his public image was definitely hurt by his involvement in a fascistic takeover. It's unlikely that the MCU will be turning Captain America into a Hydra agent anytime soon, though, brainwashed or not.Out of character?
Some fans criticized Civil War for its uncharacteristic and notably more evil depiction of Iron Man. And, in their defense, he did make a lot of questionable (to say the least) decisions. The conflict of heroes was fought over whether or not superheroes should have to register for the government. Iron Man was on the side of registration, which, when taken to its full extent, would eventually mean that any hero who refused to register would instantaneously become a criminal. Sadly for these old friends, the offenders needed to be dealt with, and Iron Man led the charge of capturing and imprisoning his old friends.
The prison, nicknamed 42, was an enormous facility inside of the Negative Zone. Unlike in the MCU, where the superheroes, like Ant-Man and Hawkeye, were let out on parole, these heroes were trapped in the Negative Zone indefinitely.Out of character?
In Avengers #213, Hank Pym found himself in the middle of a court martial where Captain America, Iron Man, and Thor convened to decide whether or not he would remain in the Avengers. His transgression was that in the previous issue, he had, completely unprovoked, went after a villain after she had already surrendered.
To garner some goodwill, Hank built a robot that he could use to go after the Avengers, thus saving the day. He was caught by his wife, Janet - the Wasp - while building said robot, and he was more than a little irritated by her intrusion. In anger, he struck Janet, knocking her to the ground. Ultimately, he was rightfully kicked from the Avengers, and Janet filed for divorce.Out of character?
One of the most controversial superhero stories of all time was published in the pages of Spider-Man. It was known as One More Day and served as a soft reboot of the life of Peter Parker, ultimately de-aging the character and stripping away his marriage. Bizarrely, it was all Spidey's choice.
In the aftermath of Civil War, Spider-Man's true identity was known to the world. He became a target, and Aunt May was hit in the crossfire of a bullet meant for his head. Parker felt responsible and was unwilling to lose her like Uncle Ben, so he traveled to all the big names in the Marvel Universe to find help for his aunt. The only being that offered their assistance was the demon Mephisto, and Mary Jane and Spider-Man agreed to exchange their marriage for Aunt May's life.
Later, Spider-Man got Doctor Strange to make everyone in the universe forget he was ever Parker. Included on that list was his ex-wife, Mary Jane.Out of character?