1. There aren't enough MTs in the U.S. to support it.
2. There is too much readily available offshore labor. MTSOs will simply move entirely offshore.
3. The "benefits" you think are there really aren't there. I truly do not know what you think unionization will do for you.
4. I pay $30 a month in union dues, and that is probably less than what you would have to pay.
Continuing this perseverative focus on union, union, union is not helping you. Take the time you waste campaigning for this and the money you are so eager to spend on it, and learn a new job that pays better. It is as simple as that.