UK is allowing US bombers to make multiple bombing runs on Iran from its bases.
Yes and that is highly problematic, and actually illegal for UK to allow! Except those runs are classified as defensive, but I don't see how you make that argument when the war is 100% the Americans being the aggressor. They can just go home, and the war will be over. USA has no need to be there, and Iran is just defending themselves. There is no way I can see to reasonably call those runs defensive.
But France and Germany absolutely did allow support airplanes in support roles to use their airfields.
IDK about France, but the Rammstein base is American, so I don't know how much control Germany has over what USA does with it. But I know they've made problems enough for Trump to be extremely pissed.
Bulgaria and Romania explicitly allowed the US to use their bases for refuelling and recon.
That is understandable IMO, refueling and recon are not acts of war. So I think they have found that a sensible balance to not seem unreasonable.
All of this...
Seems a bit like a glass half empty or half full opinion. I agree zero would be better. But besides not actually helping, it seems to me that most European countries have done a lot to prevent USA from having an easy time. This is very different from how it used to be in the cooperation/alliance between Europe and USA.
This is a very strong signal from Europe that we don't agree with what USA is doing.
AFAIK all EU countries have declared the war against Iran illegal! I don't recall that ever happening before.