All the best!
The quieter you become the more you're able to hear.
Mawlana Jalaludin Rumi
In that case...yes, those folks are basically wasting their life.
But do you typically put a big amount of weight on your shoulders before you sit in daily activities? I think where our disconnect may reside is at the practical application of the movement. I'm not really into arguing how realistic the movement applies to real life scenarios.
Your injury would be good enough to make a case against heavy chest pressing movements. Similarly, if you blew out your knee then I'd feel that sprints may be something you'd want to proceed cautiously with.
I'm valuing chest presses in their ability to cause upper body hypertrophy. The fact that your dramatic thread title calls them useless is what got me to comment in the first place.
If a log heavy enough to require a 300lbs bench press falls on you then you're probably already dead. At the very least you would be in no shape to lift anything at that point.
In all of the universe there is only one person with your exact charateristics. Just like there is only one person with everybody else's characteristics. Effectively, your uniqueness makes you pretty average.
The bench is popular because it's an official powerlifting move, the only upper body one, and the one that builds big arms and pecs, which have become popularized due to bodybuilding (and being highly visible muscles). Nobody is really making a 'functional' argument for the bench press that I can see. Even Rip says that properly weighted pushups may be a better exercise, but 'you are going to bench anyhow, so bench it is'. I'm just getting my bench past bodyweight, it's probably my strongest lift, so I hate to hate on it, but it is clearly the least "functional" of the big lifts.
If you are new to the PB - please ignore ALL of this stuff, until you've read the book, or at least http://www.marksdailyapple.com/primal-blueprint-101/ and this (personal fave): http://www.archevore.com/get-started/
1. You get taken down by your opponent, and need to push up to recover your base.
2. Preventing your opponent from breaking your base down.
3. Tying up with your opponent - I like to push them around a bit to get them to come back at me, setting up a throw or a shot.
4. Blocking a shot (if you don't sprawl).
"Don't waste your time, or time will waste you."
You ever had sex with a really heavy person? Like REALLY heavy. Like turn sideways to fit through a garage door heavy. Then that person passes out on top of you after dripping sweat in your face for an hour. Unless you can successfully press them off of you you'll most likely die of fat fold induced asphyxiation. Thus, bench press saves lives, dudes.
I've got of one them journal thingies. One Night At McCool's