It's clear you haven't been keeping up with developments in the wind industry. Except for Altamont Pass, which was built decades ago, wind turbines have not been that harmful to bird populations. Special care is taken to ensure that new farms are not placed in migration locations, and bird deaths due to turbines on a yearly average are low enough to not be a concern to the health of the species. Bats on the other hand have trouble with turbines. That's something that requires more work and investigation.
Also, a wind turbine is very similar to any other turbine based generator. They are as efficient as the generators spun by fluid flow in a nuclear reactor or a coal power plant. And all energy sources require subsidies. Look up the amount of government money that goes into fossil fuels. You might be surprised.
