There are several times in our lives when we have to make extremely difficult decisions about leaving positions, places and, perhaps the hardest of all, people. While those decisions are usually justified, do not be so anxious to completely obliterate the bridge you helped build.
Perhaps you need some time away. Maybe someone else needs to figure out what they did wrong. Just make sure you are doing the same thing as you hope someone else would if you screwed up. That said, if gasoline and matches are truly required, try to sit back and watch the show. You should not have to do a thing. Those type of people usually do a great job of burning down their own bridges all by themselves.