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Yes, Hitler did have a concern for "sneaky backstabbing" - as did most Germans after losing WWI. It even has a name, Dolchstoßlegenden. It wasn't a correct idea, and it was doubly incorrect to pin it to the Jews, but there's no great dispute that both officials and people believed it.
Does it come a surprise to you that Hitler was actually an antisemite? Did you think he mearly killed 6+ million people as an excuse to come to power while not believing it (not to mention he was already in power when he put that in process).
So, no, it wasn't just a "convenient scapegoat". People did (and do) believe those things, including leaders. Including racist, imprisoned, and disillusioned by a war defeat leaders.
In fact not just Hitler, but tons of people all across Europe, the US, Russia, etc, believed in such "jewish" plots, and still do, which is what fed the pogroms for example.
As for Stalin, he was indeed concerned of separatism from USSR, and he did want to have a good hold on Ukraine as it was an important food producing area.
>Do you think that Xi, and Co. give any real f..k for feeling of Han Chinese? Get real.
Yes. But then again, I don't believe in cartoonish evil characters.
Before the "final solution (gassing)" was implemented, it was 8 years of progressive discrimination, and repressions, which were used to erode the whatever remaining civic fabric of the state.
And when they saw no real need left for the punchbag nation, and saw no further use for millions of inmates (who still needed some minimal food, and shelter to prevent them going up in arms immediately,) and people who will eventually return Hitler a favour, they decided for a "relatively clean solution."
The few surviving accounts of HSDAP top leaders own stances on the matter all confirm this.