If they reach the launch cadence they're aiming for, the fix for a lot of things is going to become "just send another Ship".
Problems detected during orbit? Sure.
But during landing? You can't send another ship to rescue the crew that is aboard another Starship that just failed being caught.
Gliding into a large body of water, or maybe just a flat stretch of land? Planes do that sometimes.
That's not an answer to the "is this safe for humans?" question.