Demanding your MEC kill it is a coward's way out. It also doesn't bode well for your group if the NMB becomes involved. Your MEC did as well as they could have by having a couple yes votes and abstentions. The pilots must speak to have better leverage down the road especially if the feds become involved.
You may not like your MEC but they just pilots like you and I even if I don't work for your company. However, they around this garbage much more frequently than the rest of us and have other considerations such as the NMB to look at.
The next little secret: The MEC isn't this all powerful entity that half you knuckleheads give it credit to be. They only have leverage if you speak and give it to them. Stop screaming for your MEC to do your work and go vote no. It is YOU that gives the MEC the ability to do things, not the the way around. Sack up and go vote.