I was raised on a farm. On that farm and neighboring farms (and in hunting/fishing) I raised and butchered, or assisted in raising and butchering, or hunting and butchering, just about anything you can think of 'normal' in North America at one point or another. It wasn't ever malicious. We raise all the animals in clean well kept environments, and with kindness. When it was their time... it was just their time. They had lived a good life to that point, be it months or years... and they were dispatched with as little trauma as possible. As for hunting, we were taught to shoot accurately at targets before being allowed to practice on real game and were expected to kill efficiently... not lame something and have it suffer.
It was also always the expectation that one did NOT take only the best cuts and leave meat to rot. The entire animal was to be used respectfully.
Living so far south now I no longer hunt game, but (when my head isn't a bloody mess) husband and I fish the coastal flats and keep some of the catch. Since husband doesn't eat fish at all this amounts to mostly catch and release sport fishing and taking substantially less than the allowable 'limit'.
I've never felt any guilt about dispatching, butchering, or eating any of the animals that I've participated in the care and killing of.
I've known people like you describe in your second paragraph... they are not people I like or appreciate. Malicious killing of animals is weak. A disgusting character flaw IMO.