Well it is a caricature and they pose things in a jocular way as if the snails were working in the tomato plantation.
As for the damage caused to the planet by us, since I was a child at home I was taught to take responsibility for my actions, so that's why I recognize my share, plus I agree with you that if we all did our part something could be done, but most want it to be someone else who does or activates.
That's the biggest problem!