Personally I blame the fact that they all think they are fvcking John Wayne.
I met a lot of them at Brize Norton (When that was a US base) .... Totally out of control idiots who really believed that they had won WWII single handed.
Due to their being "Blacked" by the fuel delivery drivers from Avonmouth they had no go juice for their aircraft and the RAF at Lyneham were called upon to supply them using RAF drivers and fuel bowsers. I turned up as part of a convoy one day and the Yanks had over-ordered leaving themselves with nowhere to put the bloody stuff so a "Master Sergeant" instructed us to "Spray it on the grass" We did, all 7000 gallons of High Octane Aviation Spirit whilst he chewed on an unlit cigar the size of a torpedo and cheerfully signed for it on behalf of Uncle Sam. Unbelievable!
The French and Germans, on the other hand, measured whatever fuel we filled them with down to the nearest thimble full. NATO exercises ~ I hated them!