I haven't seen any serious Lib/Prog (IOW, DU-folk excluded) suggest Trump broke any law. Maybe I don't swim around in MSM sewers enough. All they're really doing is trying to make Trump a garish example of what they believe is wrong with the tax code, by speculating about the most extreme possibility of what Trump might have been able to do if years of circumstances aligned "perfectly". They don't know what Trump did in 1996, or 2003, or 2009, or ......
It's not Trump's fault if Libs & Progs don't like the law their politicians helped write. If they don't like businesses being able to deduct capital losses, stop the pointless whining and change the tax code. And watch the economy devastated as businesses stop taking risks, laying off employees, and/or leave the US. Because business people, big or small, won't stand still for government to rape them.