caterpillar and snails having a feast

I'm in 2 minds about the caterpillar. Yes, they eat some of the leaves but touchwood I haven't had major damage from them. Plus butterflies help pollinate plants.

And both caterpillars and butterflies as so pretty.

Now snails... I cant stand. Yes there are pretty ones but the damage they inflict on my veggies are just ____ . Here is a tiny bugger just getting started...