I'm also not actively participating in this strike, but personally that's because I think it's in aid of a minor issue amongst the current set of problems. As a postdoc, I'm very doubtful that I will actually be able to make a career out of astronomy, given the huge decrease in available jobs in the last few years (and the number of friends I have that have already dropped out of astronomy by necessity rather than by desire). I'm also worried for those currently doing PhDs, and the reduced level of opportunities for them in the future. I'm also deeply concerned about the level of tuition fees that will be charged in the near future to undergraduate students, as I believe that this will result in the exclusion of many students from having a university education, and hence being excluded from having a career that is based in understanding knowledge and reality. So: right now, I believe that there are reasons to strike, but a minor change in the level of pension that academics will receive at the end of their careers is not really one of them.