Remember most of the fraudsters are paid shills - paid for by democrat war rooms, George Soros, Non-profits and/or 'Foundations'. In short the folks with LOTS AND LOTS OF MONEY and a strong desire to keep their lies and liars secret.
Suing trolls would be like a tree that grows hundred dollar bills. Plus the corrupt biased press would have to cover it. It's a win, win, win, win and win.
I doubt it would be that easy to win in the context we’re discussing.