The whole premise of Captain America: Civil War is that the Avengers need to be kept in check due to some unfortunate outcomes in their dealings with "the bad guy". This leads to the Sokovia Accords.
My question is this: If there were no Avengers, the outcomes of all their conflicts would be much, much worse. And they can hardly be blamed for destroying NYC or Sokovia when, had they done nothing, NYC nor Sokovia, nor the human race probably wouldn't even exist anymore.
Why isn't the blame for these outcomes be placed where they obviously should? On the Chitauri in the case of NYC, on Ultron in the case of Sokovia, and on Brock Rumlow in the case of Lagos (where Maximoff unfortunately killed people when trying to displace a bomb into the air?
(Granted, Ultron was ultimately Tony Stark's fault...)