The base is not some favor to Spain. Who does Spain even need defending from? It is a means of regional power projection for the US, granted to them for free as a favor. They've been very ungracious guests lately.
"Who does Spain need defending from?" Nobody, because of the security architecture my tax dollars built. That's not evidence the bases are a favor to us. That's evidence they worked. You're welcome. And if they can't be used when it matters, I won't lose any sleep if they get closed.
France? Portugal? Andorra??
The bases are a remnant of American imperialism, they serve no purpose but to further American interest. Any pretension they do anything else can only be explained as late imperial delusion of grandeur.
The fact the Spanish don't let you use them to engage in your unforced act of historic self harm can be seen as yet another favor.
I'm not sure what you're referring to. There's only one war in Europe right now and it's between two neighbors.
Y'all bombing brown people again is not a war or a threat to us, it's just something we'd rather not be part of.