How do you feel about the stocked fishery?

I come from a place where no one would dream of stocking rivers or ponds. There's a native fishery which is pretty robust. We are obviously lucky.

I'm in CT now and was blown away that the entire trout fishery seems to be based on stocked fish. What led to this and are most trout fisheries like this in the US?

I know there are efforts to bring back native wild species. I'm just interested how people in the flyfishing community feel about all of this in general? Is it just a necessity because of the density of people fishing here?