What are the strongest evidence based economic arguments against expanding social-democratic policies in the United States?
I'm asking this in good faith because I'm trying to better understand the strongest arguments from mainstream economics, not partisan politics.
Many policies that are often described as "socialist" or "social-democratic"—such as universal healthcare, tuition-free public college, stronger labor protections, expanded paid leave, higher taxes on top earners, or a larger social safety net appear to work reasonably well in several wealthy countries.
At the same time, many economists and policymakers argue that expanding these types of policies in the U.S. would create significant economic costs or unintended consequences.
What are the strongest evidence-based arguments against adopting more of these policies in the United States?
I'm open to having my assumptions challenged and would appreciate responses that cite research where possible.