The point rather is: there are a ton of things that we build or do which kill birds: we clear habitat, eliminate food sources, dump pesticides and other toxic materials into the environment, build buildings and power lines, drive fast vehicles all over, keep predators as pets, etc.

I'm sure many birds are killed by wind turbines (estimates I can find in a quick search indicate 100–300k per year), and by all means we should try to site wind farms away from migration routes and take whatever steps we can to make the turbines themselves safer for birds, and possibly even retrofit or decommission wind farms in sites which turn out to be especially deadly.

However, it is not reasonable to look at this problem in isolation. If wind farms can drive coal power out of business faster, on net that is saving a huge number of birds and other wildlife.

Ultimately global climate change is going to lead to mass extinction if our current trajectory is not altered very quickly. Wind power is one way to significantly reduce greenhouse gas emissions.