I'm not sure there is record of anyone being tortured, let alone it being routine?
One of my Singapore female friends pointed out you have a far lower chance of being raped or mugged if you walk around in Singapore than in most other countries and she considered that a more important than the ability to insult the government without them trying to sue you.
But when you put it this way, it sounds like there's a link between these two properties. I don't see how restricting free speech improves the safety of women.
I don't think restricting freedom of speech helped directly but both things are to some extent the result of a rather authoritarian government. Singapore isn't perfect but probably has a better quality of life than many of its neighbours.
`Dictator`
a ruler with total power over a country, typically one who has obtained power by force.
Singapore isn't a single-party state. There are other political parties that take part in the elections. Singapore's government is made up of members from mostly one party because the people voted them in. Let me repeat the last part: the citizens of Singapore voted the party in on their own accord. That's not a dictatorship. No one pointed a gun at my head and told me to vote for the incumbent party.
And as for your point about political dissidents, while that is true and is an important part of the history, it doesn't really happen now. What normally happens is that someone says something stupid that borders on libel and defamation and he gets sued. Is is heavy handed? Probably. Were they breaking the law? Yes. Is this a sign of dictatorship? On it's own, no.
There is heavy censorship, there is the death penalty, I believe Singapore still sell land mines, homosexuality is against the law. There are many flaws about Singapore but to call the state a dictatorship is putting the wrong label on the country.
When you say `Dictatorship`, I think North Korea, Iran. There is no way in the world Singapore even comes close to being a North Korea or an Iran.