A counter argument is that absolutely everything in nature at some point dies and it tends to be unpleasant. Dying of old age, surrounded by and cared for by loved ones is kind of really unusual for most things that live. Being mauled to death by some inconsiderate predator is much more common. Whether that's us or some other predator does not really matter all that much. The end result is the same.

Lobsters don't generally die of old age; they get nibbled on by predators as soon as they stop being able to defend themselves against that sort of thing (hence the claws). Same with most other things we eat. Most grazing cattle descends from animals that move around in herds that will have the weaker/older animals picked off by predators. Nature can be cruel and we're part of nature.

So, my admittedly simplistic reasoning is that if you eat meat and have some respect for what you are eating and how it lived and was killed, it's fine. The animal you are eating would have died no matter what at some point and probably not in a way that is appreciably better and potentially much worse. Additionally with most farm animals you can make the point that it would not even have existed if it wasn't for the fact that we were going to eat the animal. We've literally created species and subspecies of animals that are optimal for breeding and farming that would not stand much chance surviving in the wild. These species would likely go extinct if we'd stop breeding them. A consequence of us being less cruel by not eating certain animals might cause that entire species to stop existing. There's some food for thought.

So catching a lobster in the wild and then eating it is fine. But maybe give it a quick stab with a knife through the brain stem before you throw them in the boiling water. Also, keeping them in the fridge shuts down a lot of their brain activity. It's a decent thing to do. A quick death and a tasty meal. Nothing wrong with that.