Is it time to start calling out bad cyclists?

Freewheel and front brake trumped by the lad I overtook today on Camberwell new road who was riding brakeless fixed on Look Delta pedals but in a pair of flip flops!

The look of maniacal fear on his face lead me to deduce he had either;
a)just nicked it,
2)was completely fucking mental, or
iii)both.

Almost certainly stolen. What kind of track bike was it?