When introduced becomes invasive

Years ago, an amazing lake near me known as Lake Pend Oreille, which is well known around here for the submarines for the Navy they test there, had only rainbow trout, kokanee, and bull trout in it. The kokanee fed on plankton and the bigger trout ate them. Then, people dumped non-native lake trout in the lake to increase the lake's fishery. Unfortunately, the lakers didn't seem to do very well at first, so people dumped also non-native mysis shrimp in the lake for the lakers to chow on. Since they really didn't eat any mysis shrimp, the bull trout began to decline, but the lake trout began to explode along with the rainbows, and they began to make the humble native kokanee die out due to depredation. Also, the mysis shrimp ate a lot of the plankton that was the kokanee salmon's staple, so the kokanee began to decline. Our Fish and Game response? Talk about and suggesting that they remove all the mackinaw, to be shouted down by people complaining of how that would ruin the lake . How stupid are we?