It had already been invaded and occupied for two decades by Polish troops, they were in no position to defend it when the Polish troops ran to Romania, sorry, I mean, retreaded to the Romanian bridgehead.
Exactly how many days in September 1939 did you defend it? More or fewer than seven?
Dude, why are you changing subject to 1939. I was clearly talking about the 1920 war.
Let me remind you about the events of the 1918-1920 events.
November 1918 - Germany signs capitulation to the Entente. Nations of Germany- and Austria- occupied territories are given green light to create their own state entities. Wilno is occupied by a newly formed Belarus (not Lithuania!). Let's assume at this point it should be Lithuanian - why didn't Lithuanians fight for it?
December 1918 - Soviets launch offensive on Belarus and capture Wilno. Lithuanian population of Wilno and surroundings is evacuated to Lithuania, Lithuania did not bother trying to fend off Soviets from that territory
January 1919 - Poles in Wilno revolt against Soviets, after 4 days the rebellion is defeated
April 1919 - Poland launches an offensive against Soviets, captures Wilno. What did Lithuania do to regain "their" Wilno from Polish hands? Nothing.
June 1920 - Soviets launch an offensive against Poland, Polish troops retreat en masse.
August 1920 - Soviet troops are annihilated in Battle of Warsaw. Retreating from Wilno, they hand it over to Lithuania, which now happily captures the territory as it's basically a free item for them at that point.
September 1920 - Polish government tries to convince Lithuanian government hand Wilno over to our hands or let Wilno's population decide which country they want to belong to. Lithuania disagrees to both propositions
October 1920 - Polish troops enter Wilno
I don't know how one can possible paint the Polish government as villains at that time. If Wilno was rightfully Lithuanian (let's ignore the fact that there we were little to none Lithuanians there), why didn't Lithuania try to capture and defend it, not even once? If Poland lost with Soviets, how long would it take for Lithuania to fall prey to Soviets, too? 1 week? Poland effectively defended Lithuania and in return Lithuania occupied Polish Wilno.