But it's also possible that no viable oppositions are allowed to organize effectively enough to compete fairly.
My personal yardstick for judging a healthy and mature democracy is counting how many times political power has changed hands without violence -- Singapore is yet to score after 60 years.
The odds are stacked against the opposition — for some reason, elected Members of Parliament are required to manage their individual town councils as well. The opposition that won a group constituency recently got a lawsuit slapped against them for "mismanagement" [1].
[1] https://www.reddit.com/r/singapore/comments/dgbe25/ahtc_case...
Adding on: this is because the PAP in Singapore controls more than two-thirds of parliament [1], and have been able to push through constitutional changes without much consultation [2].
I think the increase in the private-sector requirement for candidates of our presidency (overtly disqualifying Tan Cheng Bock, a former PAP MP who was a candidate for the presidential elections, and is now the leader of an opposition party) slipped past many of our political critics until it was too late; a lot of uproar was focused on the elections being reserved for people from a specific ethnic group [3].
[1] https://en.wikipedia.org/wiki/13th_Parliament_of_Singapore
[2] https://en.wikipedia.org/wiki/Constitution_of_Singapore#Amen...
[3] https://en.wikipedia.org/wiki/Presidential_elections_in_Sing...
Or are you suggesting the elections are marred by fraud? It has to be one of these two.