Re: The fundamental problem is that...
Until you realize those "efficiencies" come at a price that you may not realize at first.
Kill that "safe" snake? Now you're gonna have a rodent problem because you knocked off one of their more-efficient predators.
Prejudice against a whole bunch because of a few bad apples? You've just tarred everyone with the same brush. Be prepared to deal with more of the same. If people say they're evil, they may as well become evil.