I don't think blocking all goals to try to keep the score low is a viable or gp/moral/good decision. Unlike a 6v0, this hurts both alliances seeding scores. But a 6v0, like 1114 did, their alliance seeding score is improved.
Earlier in the competition, we decided to do a 6v0 against 1114, 27 and 88 by blocking both of our goals. I don't think anyone on our team really liked the idea, but agreed it was the best option to improve our seeding score*. Going against the #1 seed and two first round picks, with a team that had jaguar issues (they didn't move in the match, so we had to push them infront of the goal), we didn't think we had a chance to win the match. The decision to block our goals wasn't "lets screw over 1114's seeding score", but to encourge them to continue to score for their alliance, helping our seeding score. They scored two goals for us, but for the most part, I think it worked. A part of me was relieved to see 1114 do the same strategy in match 100, knowing they approved of it.
*This was our second match of the event, before we knew we would lose 4 matches by a combined 5 points, essentially killing our chances at seeding high...not that I'm bitter or anything
... I guess some of our luck from Wisconsin and Midwest caught up with us...