Sucks that we have to repeatedly and en masse literally inject animals with acid and observe the effects before we/veterinarians/biologists/society as a whole will believe that those animals can feel pain.
I love how this shit is only legal because we don't think fish feel pain - but turns out! They do! Gotcha! Wotcher, 'Arry!
Wonder how all those scientists torturing fish to find out if it hurt felt when the answers started coming back: Yes, yes it does. Do you feel like a shit about yourself?
Because I would feel like a shit about myself if I was injecting acid into defenseless experimental creatures on the reg. Even if it was in the name of holy Science.
Pain, like hunger, strikes me as one of those biological constructs which is probably essential to life - at least, long-term species survival.