Not collective guilt obviously, but if you're involved in conservation, you have to tackle issues such as these. Conservationists also try to right plenty of other wrongs that weren't caused by them in person, often not even by their kin.
Ideally of course, every individual who causes problems such as the introduction of alien species - whether by neglect or on purpose - should be held accountable. But many of the perpetrators are already dead, so it's up to the rest of the world to repair the damage.
Also, I don't buy the argument that is often made that "we can't entirely get rid of invasive species xyz". It's usually just a matter of effort, at least with when dealing with tetrapods. Of course, you might have to jail some of the local "animal rights activists" beforehand.