And native plant and animal diversity is zilch, so contributes to habitat loss and exterpation of species, especially insects and bugs.

Both of those may not be a big concern, depending on the situation.

Land availability in North America is not really a concern; there's a shit ton of land available. When cities expand and the golf course's land value goes way up, the course tends to get sold off.

Water use also is a case of "it depends". If the the course is using aquifer water, yes that's a big problem. Many, if not most, don't use aquifer water. In the wetter climates, most are using water pumped from rainwater fed holding ponds, or other lakes, rivers, etc on the property. Even in Arizona, most courses are using treated grey water, keeping them from contributing to any water shortages.

its a ton of fertilizer and herbicides as well.

I didn't say it was great. It's just an odd one to single out when there are sports that are far worse.