This is LKY’s view. In his one dimensional experience with Singapore, he can only see goodness in one party system and badness in everything else. I could up his ante by claiming that dictatorship is even better, without contention, with a dictator or emperor calling his shot, everything can be done at his beck and call. Super fast and super efficient, for good or for bad.
Really, every system is good and every system is bad. It all boils down to the goodness of the leader. A dictator or emperor can be an excellent leader and can bring progress and greatness to the country and people, provided his intention and goals are benevolent.
Historically the goodness of such leaders was often temporary as they soon got intoxicated by power and their own egoistic pride that they could do no wrong or they were gods. There have been many such examples when the leaders could not see glaring mistakes of their own. They will believe only in themselves and their self serving logic.
We have seen that, and have paid for it. All men are fallible and corrupt to a matter of degree. A one party system can be good but can also entrench corruption and misdeeds of the leaders. And in such a system it is very difficult to dislodge them and undo their wrongs. To make matter worst, one party rule or its dictatorial equivalents are often run by strong men that makes removing them even more difficult.
Two party and multi party systems have their strength and weaknesses as well. But given leaders with good intention, from both sides of the coin, it can be a more amiable system, more compassion, less brutal and brash in policy making. In a mature society where the leaders of both sides are made up of honourable men and women, knowledgeable and wiser, all striving for the good of country and people, and not self serving, it can be much better than single party system that often failed to check itself and its own abuses.
Single party or multi party systems are just systems. It is the leaders that make them good or bad. We have seen how a single party system can be good and also can be bad. It is not the panacea or the only panacea for good governance. It is as flawed as the leaders running it.