The sole reason Germany annexed Czechoslovakia was was that there were atrocities being committed against the Sudeten[0].

He even made a speech at the Sportpalast in Berlin in which he stated that the Sudetenland was "the last territorial demand I have to make in Europe". So all's fine, and we don't have to worry about Germany.

0: https://en.m.wikipedia.org/wiki/Lesson_of_Munich

One big difference, is that the opposition to nazi Germany was relatively weak before the start of WW2:

After Reginald Drax's mission to Moscow failed, the Soviet Union ended up signing its famous non-aggression pact.

Italy was allied, Spain was neutral/aligned. Turkiye was neutral.

Poland could only count on UK and France[0].

Compare to now, where the NATO military bloc is massive. No one would dare risking a military confrontation in these circumstances.

If anything, when there are any tensions between two non-NATO countries, it makes it more urgent for one to oppose the other joining NATO (attacking before they'd join NATO would stave off them joining, attacking after they'd join NATO would lead to an unwinnable fight).

0: https://en.wikipedia.org/wiki/Anglo-Polish_military_alliance

The article you cite says nothing about the /alleged/ [by Hitler as a pretext for annexation] atrocities against Sudeten Germans. The expulsion of Germans from Czechoslovakia _after_ World War II was an ugly chapter, but really -- there were no 'atrocities' being committed against that population /before/ the war. See also https://en.wikipedia.org/wiki/Sudeten_German_uprising