Animal rights people saying you cannot kill mosquitos for ethical reasons is such a small minority, I guess it must be lower than 0.0001%

Most vegans and vegetarians I know choose that lifestyle because they see a problem in the ecological and environmental implications of eating meat and for political reasons of how animals are kept.

Have you seen how intensive animal farming works in practice? Even as a meat eater one must admit the conditions are cruel. I don't think we do this with mosquitos.