To be fair, the guy in the story you're linking to overstayed his visa by over 6 mos. This cannot be seriously considered an "oversight", and Singapore is not known for leniency to lawbreakers, which he clearly is. He rolled the dice, and lost.
I agree they were enforcing their laws but to me they seem a bit harsh. I'm glad that in the US you don't get harsh punishment for being here illegally.