I dunno how some people are comparing unfertilized eggs to a living, swimming fish in the lake. The effect of taking that living, swimming fish and nailing it up to a board for a few pictures has a way bigger impact then stripping a hen for roe. If done right that hen will go back into the water and live to spawn another day. That fish you nailed to the big white board is done forever, it has zero chance to reproduce...
Perhaps maybe changing the regs to only taking the smaller males with a slot in place? Who knows.. But I don't think roe anglers are the solution to the problem.. Hatchery roe is becoming more and more popular every year.