Yes it would. Some people just can't do it.
+1 with the above comment. Some people see this as a "more humane" way to put their fish down. I've seen quite a few people do this with their larger fish, like discus or cichlids. If they have a large tank with an expensive stock, they will then take the fish to a vet to test to see what the fish had (if it was a disease and not old age), so they could treat their tank as such.