Simply put, I think Americans don't grasp it because even for us Europeans it is sometimes surprising how repentine and fast the shift has been in the regular Joe's brain - I'm not saying that Americans are stupid bla bla thing -, I'm saying that it is normal not be as up to date with some phenomena as people living where that phenomena happens.

Also, at least the Italian government is still dancing the tip tap regarding a position on America, not taking any definitive stance or doing anything significantly different than before, which is a big rift wrt what people want. Only exception for defense expenses

I don't think the first group understands how important Europe is to America's status as superpower, while the second group operates under the delusion that the world will go back to business as usual after the next presidential election.