Like any man-made system, there will be people who will try to circumvent the system. But as a democracy, it also exposes such cases earlier than other systems.
The fact that such a case was made public, and that the media, and the Senate committee shamed the five is unimaginable in a dictatorial system.
My point is that it doesn't mean that if the Keating scandal happens in the US, but doesn't happen in Singapore, means Singapore's better. It just means the system in the US detected a virus, and exposed it fairly early. In contrast, in Singapore, as long as the politicians are in control of everything, who knows what these politicians do behind the people's back, in collusion with big business leaders, corrupted accountants and lawyers and what not?
Sweeping bad things under the carpet, as what happened many times in Imperial China, and now in Singapore, and in Malaysia, puts paid to the 'fact' that dictatorial governments are better than democracies just because the media doesn't expose such scandals and the people are ignorant enough to bo-chap.