Seeing a graph of the volume of BTC Volume by Currency
And at the moment The euros only participate in a 3.24% of the volume very similar to the Chinese yuan of 3.21%
In my opinion, the volume managed by Europe is small compared to the US dollars, 25.04% and the Japanese yen 57.36%.
given that it seems that in Europe the bitcoin is better accepted than even the US.
Is it because they are more stable countries and trust in their currency the euro that will not devalue much, or do not trust the BTC so much?
in fact the pound of England does not appear, it is included in others.

Because Europe, as you call it, is not a whole. When you talk about Europe you actually mean countries which have the Euro as currency. Some of them are more bitcoin-friendly but most of them dont.
I dont see why you say that European countries are more stable than the US. Greece, Spain, or Italy are more stable than the US? I dont think so. The European Central Bank has as a core mission to control inflation so, in theory, currency should not be devaluated much but in practice when problems arise it can be devaluated as much as needed.
For me its not surprising the volume of btc-Euro trading.