Why would a rational actor want to do that though? Show me a single decision theory that does reasonably well in game theory simulations (I mean R-CDT/UDT tier)

Why would a rational actor want to do that though? Show me a single decision theory that does reasonably well in game theory simulations (I mean R-CDT/UDT tier), that also supports maximin, and I'll write a 1000 word article in the praise of John Rawls.