But, software can be made relatively secure, for instance by using a secure channel within a closed IRC community. But when joining open public channels we are out in the open.
Watchdogs. Some actively sniff, some only use their nose passively. Some bark, some bite, and some can do both (but usually not at the same time). And not just watchdogs, other animals can guard the place as well, maybe even better. Each species has been domesticated for particular species detection. And some would-be-predators make for excellent prey.
My dogs are led by a shark and hunt together in one pack