Avengers is the peak of US militarism

A elite military counter-terrorism group. Ready to step in whenever there is a "threat". Even when the threat has a point. Ultron saw the fault in humanity, he saw beyond all the nice words politicians use and saw beyond the naivety of the Avengers. Try something new? No, the reactionaries will do everything to stop something that could make a change, or anything that is built on cooperation. Status quo should remain but with a elite militaristic group.

"Militarism is the belief or the desire of a government or a people that a country should maintain a strong military capability and be prepared to use it aggressively to defend or promote national interests."

"A reactionary is a person who holds political views that favor a return to the status quo ante, the previous political state of society, which they believe possessed characteristics (discipline, respect for authority, etc.) that are negatively absent from the contemporary status quo of a society. As an adjective, the word reactionary describes points of view and policies meant to restore the status quo ante."