Earlier quoted context omitted.
If a one brick thick straight wall can't stand, then you don't have a wall you have a pile of bricks. It's pointless to consider the impractical case.
Most will stand unless they need high wind resistance (or are buttressed). There are many practical cases for a straight wall of bricks, it's not an "impractical case."
Caveat there is quite significant.
> There are many practical cases for a straight wall of bricks
Indeed the vast majority of cases yes.