The thing is that the MCU movies has always made it a big deal that they try to prevent casualties. It's not like they were Man of Steeling it and hoping people could survive two super powered beings ramming through their living room at the speed of sound. In Avengers 2, we see Tony send the Iron Legion in to protect the people in a local village, for example. In Avengers, they were making an effort to keep the fighting contained and making the effort to protect civilian populations, like when Cap went to protect that diner.
I won't say that I think those numbers are realistic, but in universe it makes sense that the casualties aren't absolutely catastrophic.
As for why they need to be held accountable, they are a group of people running around to different countries and fighting people. Some of those people may be local heroes or protectors (This is actually a common thing) who have the locals support. And the Avengers come in, arrest or kill the local heroes and a dozen people get killed in the fighting. Who do you think these people blame? Not their local heroes.
And yet, these people are not responsible for answering to anyone. Most of the world would probably have a problem with people who seem to bring war and conflict wherever they go. Even the US citizens would have to ask why Captain America and his buddies destroyed three multi-billion dollar pieces of military equipment and dropped them on DC. I doubt too many believe that Nazi's were going to systematically eliminate countless people around the world with them, even IF they were told as such.
I won't say that I think those numbers are realistic, but in universe it makes sense that the casualties aren't absolutely catastrophic.
As for why they need to be held accountable, they are a group of people running around to different countries and fighting people. Some of those people may be local heroes or protectors (This is actually a common thing) who have the locals support. And the Avengers come in, arrest or kill the local heroes and a dozen people get killed in the fighting. Who do you think these people blame? Not their local heroes.
And yet, these people are not responsible for answering to anyone. Most of the world would probably have a problem with people who seem to bring war and conflict wherever they go. Even the US citizens would have to ask why Captain America and his buddies destroyed three multi-billion dollar pieces of military equipment and dropped them on DC. I doubt too many believe that Nazi's were going to systematically eliminate countless people around the world with them, even IF they were told as such.