Earlier quoted context omitted.
A lot of Americans have/had home equity as their biggest asset.
That's true, but also a non-sequitur, since nobody "stole" home equity from anyone. The value of homes went down across the board because of oversupply, and that is a phenomenon that required potential homeowners, financiers, builders, and other entities to tango. It's not something the banks caused to happen on their own, nor something they bear sole and unmitigated responsibility for.
From Joe Sixpack's perspective, he paid his mortgage every month for 20 years, was all set to retire on his home equity, and then poof, the rug got pulled out from under him.
It's a bit of a tall ask to say he should've seen that his home was overvalued and planned accordingly when all of Wall St couldn't see it either.