So do you think Poland should not have gained her independence in 1918?
The Second Polish Republic is another matter altogether from, say, the Frankenstein that were Yugoslavia and Czechoslovakia. First of all because ut had been a country before. More importantly because the monarchy that had ruled it, tsarist Russia, no longer existed.
Which isn’t to say its independence was planned well. The Danzig issue gave the slightest bit of credence to Hitler’s claims, which were based on Wilsonian principles. Also insane Nazi principles, but to the outside world principles of ethnic self-determination.