I think noone argues that 100ml is safe, and 101ml is dangerous.
As stated in other comments, explosives can be transported more easy in liquids. That’s why there is some limit to how much liquid you can take with you. Luckily that limit is not 0, that would make travel without check in luggage virtually impossible.
The limit of 100 ml is a reasonable value, and the good thing is that it is standard everywhere. Otherwise security would take forever, imagine all the Karen’s -“last time I took this much and it was okay”, “I brought this bottle on the flight to here and it was okay”…
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