The birds may not notice something that is far away at the moment, but the blades move much faster than they seem to move, and the birds are toast. There is nothing to hear: "Swish...whack!" So, what is the punishment for birds not noticing? Death? You are good with that. Blame the victim. (By your argument, no birds should ever collide with aircraft, but they do.)

Their power efficiency is poor (dependent on the cube of the wind speed), they do not work when the wind is low (or high), and they occasionally catch fire and self-destruct. They require backup power to compensate for when they are not providing power, so you are really buying two power supply systems instead of one. The subsonic sound from the blades has been associated with health problems and sleep loss in the surrounding community. The economics have been distorted by subsidies. They cannot be economically repaired and upon decommissioning must be parted out and buried. Shall I go on?

Quiet, unobtrusive, highly reliable power is available from nuclear energy, which has been demonized by the anti-witchcraft know-nothings.