Really? People, it is a matter of opinion on how animals should be treated. Not everyone thinks humans are 5x more important.
Murray McMurray is a hatchery like any other big name hatchery, their parent stock to the chicks you receive get the same treatment any other commercial operation gets. They need a LOT of eggs to hatch and sell a LOT of chicks, so naturally, just picture in your mind how that goes. 
		
		
	
	
 And consider that they don't even show people how it goes, they just show the end resulting chicks.
I think if you really want something humane, try going to a local breeder or something and check out their housing, see if YOU approve of it, and see if their birds are meaty enough for YOUR liking. Some breeds and some strains aren't good enough for meat, and the top rated Cornish X I wouldn't recommend to someone who was a vegetarian and wants humanely raised meat. Cornish X were bred to grow as fast as possible, meaning if you let them eat what they want like in commercial production, they can have some serious health issues. Yes some people pasture raise them but they're still the same Cornish X, growing out of control and always requiring special needs. So it is up to you to decide.
Sadly not many people sell chicken that is pastured and not Cornish X so if you're against it, which that's all up to opinion, it's a little tougher to find someone else to sell you chicken. Some people do "Freedom Rangers" though, they're quite a bit better. Few people do Heritage Breeds for meat, which always taste better but about half the suppliers if less have birds meaty enough to really enjoy what you paid for. (
most heritage breeds are from production/egg laying strains)
So in a nutshell, look around for local producers, and ask to see what the living conditions are. And if it concerns you, ask if they're Cornish X or not.