When Freddie decided to start sporting the 'tache he'd finally come to terms with his desire to fuck the living daylights out of Adolph Hitler. The idea - originally - was for him to sport that same little bit of hair under his nose that the Fuhrer had made so famous. Fred was still able to wear the leather he'd fantasised about and which he'd dreamed of dressing that little prick in, but the facial hair thing was just too obvious for the flag-waiving, t-shirt-wearing Queen saddos to cope with and he feared having nothing other than Munich to fall back on.
And, LITERALLY, he "fell back" on most of Munich whilst full of coke and vodka in search of the closest he could get to that little twat who was gutless enough to duck out of being captured by a superior fighting force.