There is no question that public sector unions create a conflict of interest, where politicians who represent the taxpayer are pitted against the taxpayer in union negotiations and crafting of policy. The result is public unions collecting compulsory dues, funneling them into Democrat campaign coffers, and Democrats crafting policy favorable to unions in return, no matter how bad it is for the taxpayer. It's an unethical, immoral, incestuous cycle.
PSUs should have been outlawed after the 2002 election, when the GOP had a majority. But they didn't have the guts or the will, and now there is not likely to be another opportunity.