Officially the 'Victory roll' was frowned upon in the RAF because of the very real possibility of a loss of control. A victory or aileron roll carried out at high speed and low level, is inherently dangerous because the wings lose lift until, by the time they are vertical, the only thing keeping the aircraft flying is a small amount of lift from the fuselage and momentum. In the meantime the aircraft is losing height while the nose is well below the horizontal plane meaning the pilot has to pull the stick back at the same time as he is completing the roll. It can look great but in the hands of a hyped-up, possibly tired, possibly inexperienced pilot it could also lead to a hole in the ground.
Secondly there was the possibility of combat damage to the aircraft, such as damage to the control lines, which could lead to a crash.
So, while there was also a feeling that victory rolls were too showy, there were practical reasons for the RAF and other air forces dissuading their pilots from carrying them out.
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