The parents realize that their children will be screwed if they don't get into a good college, and the poorer parents need scholarships too! The principal's philosophical musings won't pay the bills.
People who are homeless or starving are mainly mentally ill, or simply have no skills to offer any employer and no desire to do any better.
basic woodworking skills are things that they can start picking up in HS shop classes; I spent summers working in a furniture factory framing chairs as a kid.
got a neighbour who does asphalt paving -- just driveways. Dude is booked solid through the Fall and into December, and does alright. Not Palo Alto FAANG money but he's got a nice truck and a fishing boat and a nice garden that we bonded over / share tips about. point is: plenty of options for doing alright; the rest of the world ain't SF or NYC
As someone who never ever even remotely had the grades to get into an engineering program and has spent his entire career as a robotics engineer, experiencing a lot of terrible engineers with advanced degrees (among a ton of incredibly brilliant ones!), I'm just not sold on it being that big a deal. I think the larger harm is a parent applying that kind of pressure.
All that being said, everything in moderation. I don't think it means, "hey let your kid do whatever." But it also doesn't mean, "force your child to study the violin and load them up with an entire childhood of structured programs until they hate you."