Fallacy:
"If you want to overthrow the government, you are a traitor and should be dealt with as such."
Response:
A person cannot be a traitor to something to which they have sworn no allegiance. Since anarchists have no obligation to the state (or country, i.e., its government), and have made no promises to it, or, if they have in the past, they have elected to dissolve such contracts, they cannot be traitors to it—enemies of the state (T-shirt), yes, traitors, impossible by definition.