The country is at war. This is seditious.
The people in that office that put that poster up (the 'victory to the enemy' one) ought to be shot or strung up.
On top of this, since these bastards are Trotsky-ites, they de-facto have no concept of "private property." That is public property therefore, and just as much my property as their's. So it's our duty to take it down.