I was going to make a joke about how it was really because they were hiding Nazi gold but…
Although these bombings were attributed to error, some historians have suspected that the Allies wanted to send a warning to Switzerland for having collaborated with Germany.
Several Swiss cities were bombed during World War II because they were mistaken for Germany. https://en.wikipedia.org/wiki/Aerial_incidents_in_Switzerland_in_World_War_II?wprov=sfti1#Bombing_incidents
I was going to make a joke about how it was really because they were hiding Nazi gold but…
An easy mistake at any altitude.