Should SG Law be like this ?

Was reading IS when i came across this article from "Police declare joggers an "illegal assembly"" by Yawning Bread.

I dunno about you. But this is damn funny and ridiculous when our enforcement can selectively enforce the Miscellaneous Offences Act (on Illegal assembly) and on certain groups of individuals.

Shouldn't the law be applied across the board to everyone? I could go along Orchard Road any day and easily identify pockets of people that are committing this offence. And by the time i'm done, probably Orchard Road would be a stretch of ghost road. If the law is ambiguous, shouldn't the legislative or judicial people look at this act to either clarify it or abolish it if it can be abused?

I can't say with a straight face that i'm proud of our enforcement agency anymore. Sad.