Sorry to hear about your beans QG, sad and maddening I know. I try and do a lot of slug control in spring, get the breeding population before they ge started ( and if they are in the process of just getting started at least they die happy).
If you get a bit of damage one night, get out there the next night as they will folow their previous nights trail back to the same plant, others seem to join the trek.
As slug pellets attract slugs IN to the garden, I resist as much as possible, have used them in greenhouse a couple of times when I couldn't catch the blighters.
On GQT there was once a question from somebody who used slug pellets, yet she still had problems while her neighbour, who didn't use them didn't have a problem, the panel suggested she was enticing her neighbours slugs into her own garden.
Thing is, slug pellets are so cruel, I hate slugs as much as anyone, but they are living creatures, just surviving the only way they know how.
But imagine eating poison and laying there all night dying, then to be tortured in the heat of the morning sun. If I have used them, I've gone out regularly to kill any that are about, and remove them before good beasties pick them up.
Thrushes are in decline, they were known for eating snails, could there be a connection?