Dear Reb Eliezer: General Flynn (a three-star general) was bankrupted by legal fees paid to try to defend himself. He lost his house. Then he was threatened by Government prosecutors: Either plead guilty or we will go after your son.
What would you do, Reb, if the Government did that to you???????
The Logan Act: The Logan Act was passed in 1799. No one has ever been found guilty of violating the Logan Act. And no one has even been charged with violating the Logan Act since before the Civil War (1861-65). Logan Act maybe unconstitutional due to vagueness.
Finally, even if Flynn did lie to the Vice President, that is no crime.