Re: drain the swamp
Flynn didn't make "just one mistake", and his lying to the FBI was far from his only crime. That's the only crime they're CHARGING him with, because his other crimes are being swept under the rug in exchange for his cooperation. The reason they charge a cooperating witness with one crime is to allow the FBI to have continuing leverage over him in case he stops cooperating.
It must be exhausting to keep trying to put a rose colored tint on Mueller's investigation, as it closes it on your orange hero by the day.