But, IIRC, it wasn't even much of...but yeah, I did misread your post.
I've found conflicting sources on that, actually.
Each german and polish census showed a polish majority in the, very short, shoreline that was given to Poland after ww2. Really, no doubt here. I was searching for an old book I have on this subject, but I lost it somewhere, unf. Therefore, I attach 1912 polish map, based on official censuses; while the russian parts are extremly biased against the Poles (f.e. Wilno and Grodno areas even today have a polish majority, but on this map there are hardly any Poles there), prussian and austrian numbers seem not to be very biased.
I've painted three lines here:
red - territory with polish majority
yellow - post-ww1 polish border
green - pre-partages polish border
As You see, Poland only got territories with clear polish majority, and only some of it. the majorly non-polish cut are the regions of majorly german cities of Torun and Bydgoszcz, which I have mentioned earlier.
Yes, exactly. Which is why the Germans ought to be reasonably understood when they clamor for its reentry into Germany.
But You do understand there were majorly polish areas in Germany and Poland didn't demand them, right?
That's not the point. If some mugger on the street holds a man at gunpoint for his wallet, but the man runs away and the police later catch the would-be mugger, would the man not still want the mugger to be punished?
In this case, the man at the gunpoint got his wallet back, earlier got insurance money for the loss and financial aid from the community, and later started killing his neighbours, and stealing their money.
Hell, I don't know, it was a bloody example.
There's no such thing as bloody example. You must take responsibility for your words. If You say Germany should've lost less land, be precise. I think Germany could have lost much, much more lands, based on ethnicity
To Poland
- entire Masuria
- southern Ermland
- Powisle region
- Zlotow region
- Babimosc region
- the rest of Upper Silesia
To Czechoslovakia
- the part of Klodzko/Glatz region that was czech
To Luzyczans
- Luzyce (they could've been made independant
To Frisians
- Frisia (could've been made independant
Fine. You explain the reason for the German outrage at being blamed for the entire war.
No-one likes to be blamed for anything bad. But it's not a reason to go to war.
nor lenient enough to prevent the Germans from getting angry over its clauses.
If Germans lost anything in the east, but only didn't GAIN anything, they would still be angry, probably. If there was no polish part of Pomerania and Silesia, they would be complaining about Major Poland ("Posen") region.
Is it anathema to be able to see both sides of a coin? That's all I'm proposing to do here.
The problem is that "understandable" has a slight meaning of being right.
I would say that, hm, people should not be suprised at German reaction, but their reaction was not right, and not reasonable.

The country to which a given territory belongs does not determine the ethnicity of the people in it. For example, during much of the same period, what eventually became East Prussia was officially under the Polish crown, but I hardly think anyone would attempt to claim that Königsberg was Polish in ethnicity. Danzig was majority German from a period around the middlish of the 14th century, although God knows that's not my particular field of expertise so I wouldn't be able to give any sort of exact date.
When it comes to East Prussia, a significant part of its population was polish, the first polish paper was being published in it, many important Poles lived there, it was the biggest centre of polish reformation, and southern part of Eastern Prussia indeed was majorly polish until ww2.
But that's not the point. You mix historical rights with ethnical rights. Both are important. The city belonged to Poland for the definite most of its history. Originally it was polish. It was located at the mouth of a polish river. Imagine in XV century Algeria claimed Marseilles, because "since XXI century the city is majorly algerian"
Gdansk was german by ethnicity since XIV century, but was nevertheless a polish town, sharing polish history, being part of Poland, and being happy with that.
Also, the language didn't mean nationality before XIX century. Gdansk joined Poland voluntarily. I remember that during a war that broke out for polish succession (I, sadly, don't remember if it was the one between count Conti and August II or Stanislaw Leszczynski and August III, but notabene, Gdansk supported non-german candidate) a song of this city, in german, claimed the city to be "the heart of Poland". After Gdansk was captured by Prussia, many Danzingers, including Schoepenhauers, emmigrated from the city in protest, and german-speaking citizens of Thorn welcomed Frederic II with bullets.
Did they even try, ever, to stop said persecution?
in vain
I don't believe that a war would have been averted (I mean, come on, it's that lunatic Hitler we're talking about here); a war between Germany and Poland might have been, though. With the caveats that you yourself mentioned later.
Isn't it better, then, that Poland was so strict about Gdansk? If not, the war would have started later, with even better prepared to war Germany, and probably with Poland on german side, therefore with much bigger chance for Axis to win.