Here's what the argument boils down to, mastermuse. Some players on this site argue that having a PPSC approach rewards effort, which is essentially what you argue. A player might not win a game, but they will be rewarded with points based on their performance. This encourages players to forgo playing for the win in order to play for a strong second to get points.
There are two issues with this approach. First, and foremost, is that our standard of measurement on this site, Ghost Rating, punishes losses and rewards wins and draws, depending on who else is in the game. A draw against good players is potentially better for your rating than beating bad players. When a player in a PPSC plays for a strong second for points, and someone else wins, it still counts as a "survived", which is the same as a loss in your rating. Essentially, if you want to be regarded as a quality player, your GR is what matters, as opposed to the number of points you have. PPSC proponents generally do not care about this rating; hence, the irreparable difference of opinion.
The second point has to do with the quality of the game itself. Most of the better players on this site would argue that if you cannot win, you should do your best to prevent others from winning. WTA encourages players to play for the win, but if a win isn't possible, it encourages players to work together to prevent the win; otherwise, they get nothing for their effort. This is more reflective of real life and real diplomacy. Sometimes, you win, but most times, you are forced to compromise for the greater good of the players involved.