I don't believe there is any evidence that he ordered that guy to tase himself in the nuts.
Where have you seen the best-articulated version of this argument?
The crimes matter because murder is clearly illegal. John Gotti was convicted of murder.
If Trump's financial crimes were as obviously illegal, and as readily provable, there are multiple prosecutors who would be eager to go after him. Anyone in the Manhattan DA's office, Justice Department (which would also include US Attorneys for Florida) and the New York State Attorney General's office would see their careers and reputations skyrocket if they can convict Trump.
There's an interesting podcast that's a spinoff of KCRW's Left, Right and Center called All the President's Lawyers, dealing with the legal questions of all the suits against Trump. The latest episode considered the implications of the indictment of the CFO of the Trump Administration, and addressed Trump's legal liabilities and potential defenses.
Their conclusion is that Weisselberg is likely in a lot of trouble given the shamelessness of the tax fraud (two sets of books to undercut an argument about gifts not being compensation) but that Trump's unlikely to be prosecuted.
https://www.kcrw.com/news/shows/lrc-...sselberg-trump
The idea that it's obvious that Trump can be convicted by a prosecutor who tries hard enough is harmful if untrue. It diminishes people's faith in the justice system if things go as normal.