I really like house cats (we have two) but hate feral cats. In one environment (in the house) they're a net benefit and in the other they're a disaster.
There are invasive plants that do a ton of environmental damage, too. And insects transported both by shipping, and by exotic animal keepers (non-native isopod movement by animal keepers is an environmental problem that is almost completely ignored both by hobbyists and regulators/legislators). And all the ill conceived intentional releases of things from ladybird beetles to house sparrows for various reasons.
A big problem is that almost everyone focuses on some certain species or other (depending on what a group thinks is cute or scary, as you point out) rather than the general problem of humans being "bulls in china shops" with almost everything we do.









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