I'm not trying to tick anybody off but I have a large pond at my house and it's full of bass, bluegill, Shad etc. I monitor the beds in the spring when the bass spawn, and I've seen bluegill team up and chase bass off beds to get at eggs and hatchlings. I've seen bass do the same to bluegills. I have fished the beds before and caught fish off them. If bass are released fairly quickly the swim right back to their bed with no ill effects. Predation is a fact of nature, whether it's man or another animal. Man is intelligent enough to make a decision on what he thinks is right or wrong.