Nebulously talking about
known problems without naming them just shows you don't know the problems or won't enumerate them in fear of sounding ridiculous.
If I have my own source of electricity not relying on the grid, then that is my decision. If it makes business sense, why should I forego it? If it satisfies me as a hobby project, why should I abandon it? If the utility wants to pay me for my leftover electricity, why not sell it to the utility? This is none of your concern.
And the alleged problems for bird life are about the same than each single tree on the landscape. Yes, birds sometimes hit trees, because either they have misjudged their trajectory from the start (birds can be clumsy too), or because a sudden gust of wind blew them away. I sometimes find birds knocked unconsciously on our terrace, because they flew against the wall. Shit happens. To make this a problem of wind turbines is just arbitrarily and selectively projecting blame.