But they can be eaten, or turned into gold, or juiced, or turned into a labor force, or...
Wait, what was Gargamel's actual plan?
They are an invasive hive mind species that absolutely destroy local mycelium networks affecting huge areas of old forests and what not.
The nasty little creatures are really hard to exterminate without causing damage to the environment so now environmental conservation heroes need to kill them one by one.
In large numbers the little shits can also be a threat to an adult human, they will tie you down & use your body as an incubator for their young (which keep the host alive for as long as possible for obvious reasons).