It's a lot like keeping walleye over 23" (or whatever your number is). To each their own. As long as they're legal, you should really just smile and move on. Be glad you have an ally in the field. If they busted your roost this weekend, they might've made someone else's next weekend. Who knows, they might've only shot 2 spoonies in 'your' lake of drakes but for them made memories that'll last a lifetime. Who knows. Who cares. Relax.