The last argument there seems one that would appeal to people on the right only who would be against this because it's considered "big government" anyway.
I'm on the left, am extremely pro-union (I think tech needs to organize ASAP), and I'm troubled by public sector unions. Private sector unions have different incentives than public sector unions, and there's a pretty obvious track record of abuses among public sector unions.
The AFSCME (lobbying organization for public employees) is in the top 5 for campaign contributors since 1990 and supports Democrats almost exclusively. Lots of republicans who aren't hardline ideologues oppose expending the influence of public employees' unions.