I see a lot of articles from liberals complaining about private…

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https://reason.com/2015/06/02/are-for-profit-prisons-or-public-unions/
I see a lot of articles from liberals complaining about private prison companies. Yet government prisons house 92% of all prisoners. And lobbying dollars spent by police and prison guard unions dwarf the amounts spent by private prison companies:

"The California prison guards union, for example, poured millions of dollars to influence policy in California alone—it spent $22 million on campaign donations since 1989, more than CCA and GEO have combined, and continues to push for prison expansions. The National Fraternal Order of Police, meanwhile, spent $5 million on lobbying efforts since 1989, more than GEO did. That's not to mention the American Federation of State, County, and Municipal Employees, which includes a "Corrections Union" and lobbies on behalf of all kinds of policies that seek to turn citizens into revenue sources for public employees. They've spent $187 million on campaign donations since 1989, making a far stronger case to be labeled the biggest lobby nobody's talking about than private prisons."

https://reason.com/2015/06/02/are-for-profit-prisons-or-public-unions/

I wonder what would incentivize liberals to advocate for government prison reform as much as they advocate for private prison reform?