Republicans in Wisconsin abolished public unions back in 2011 (though admittedly they had exemptions for police and firefighters) and there was nationwide outrage from the left about it. There have been recent calls from the left to abolish police unions but those seem almost exclusively about police unions' ability to protect corrupt/brutal/racist cops and not about their ability to bilk taxpayers.
So while it's not completely clearcut, the right has a much better record for opposing public unions than the left.
You have begun to see labor movements distance themselves from police unions. I’d expect at some point it will be politically acceptable for Democrats in places like Wisconsin to strike back at them, which I’d support. So long as the other unions in the public sector are broken too.
No public sector should be able to unionize. If these groups want to lobby then fine. Lobbying, although corrupt in many ways, does not beholden tax payers to corrupt contracts.
What better way to consolidate power than by aligning with a public service union and “bargain” with them while being incentivized to grow membership in that union to further consolidate power.
If anything I’d support public sector unions if members were not allowed to vote for offices that represent their “management” or control their budgets.
Could you imagine a private sector union appointing the management of the company they negotiate with?