Simply put, superheroes are "doing justice for heaven" for the purpose of behavior.
So the reason why The Avengers is called "The Avengers" is not to organize a superhero to retaliate against someone or an organization, but to avenge all the innocent people who have been hurt. Just like Captain America led a team to catch a criminal discharging device, he read out his crime "How much property damage you caused and how many casualties you caused" before he started, and finally shouted "Now we will avenge you on behalf of the victims!"
Forever protecting innocent people from harm is the meaning of the Avengers.
: In comics, The Avengers first appeared in 1963' s ancient comic book The Avengers Vol 1 # 1. The wasp girl improvised her name, and Ant Man made the final decision.
Excerpts from the dialogue are as follows:
Ant Man: Wait! Before we part, the wasp and I have something to say! Each of us has different powers! If we unite, we are almost invincible!
Iron Man: Teamwork? Why not? I agree! Thor, we can do many good things!
Hulk: I'm fed up with being chased! I'd rather be with you than against you! So, whether you like it or not, I'm in ... this ... hey! What do you call yourselves?
Wasp: That's right! We need names! It should be something colorful and dramatic, such as ... The Avengers, or ...?
Ant Man: Or nothing! That's it! The Avengers! ! ?
Iron Man: We will fight together or separately, if necessary! ?
Hulk: I sympathize with the guy who tried to beat us! ?
Thor: We will never be defeated! Because we are ... The Avengers!
In the movie, it first appeared in the egg part of Iron Man 1:
Tony's explanation in The Avengers 1;
The Interpretation of Loki in the Documentary Marvel Comics Films: Cosmic Gathering;
(The following is a coherent fragment)