I've no problem with this sort of thing....quite the opposite, in fact. It makes for interesting gaming.
My problem occurs specifically when the players
know that, regardless of their actions, and regardless of their choices, they're always going to have another chance. No consequence is final. IMHO, that turns the games into Snakes & Ladders....except that you have to start over whenever you might have won until your kids succeed. Winning is hollow (although the degree by which you win might not be) because you can just keep slogging away until you happen to succeed. And after the sixth or seventh time that the BBEG tosses you into an inescapable death trap, or a slave labour camp, or whatever, instead of just killing you, the voice of Scott Evil seems to get overwhelmingly loud.......
Conversely, when you know you can lose -- not just have a setback, but lose -- then you know that you've earned your victory. It may be true that D&D is "always a bunch of people sitting around a table rolling dice and talking about the imaginary things their imaginary friends did" but chess is likewise always two people pushing pieces around a chessboard....that doesn't mean that it's okay to cheat, or that you want your opponent to throw the game to give you a false sense of victory.
IMHO, of course.
RC