I am a teacher and I fully recognize Bevin's that Bevin is trying to save my pension and am thankful that he's doing it. I know that I'm not alone among teachers, but I'm certainly in the minority.
As for why more teachers aren't like me, well, that's seems to be a mixed bag. Some teachers are simply misinformed, others are beholden to their union and won't listen to reason. Most I've met, though, are simply in denial. When I point out to them that their retirement is in real danger of bankruptcy within their lifetime they usually say back to me, "But I was promised a full pension!" Correct. You were promised a pension by democrats that are long gone. They lied to you. They all lied to you. Now, you finally have someone telling you the truth, but it's a truth you don't want to hear. Classic cognitive dissonance.