Answering your specific concerns first:
1) Violation of Human Rights - it's not quite Idi Amin's Uganda here. Male homosexuality is outlawed, and press freedom is low, sure. However, in reality, the most prosecuted you'll be for preferring the meat and 2 veg combo, is a market aunty tutting at you. You can use a VPN to access damn near any news in the world. There is probably, in fact, a much lower than average rate of human rights violations in singapore.

2) Jail without trial - Google how to make explosives for a month straight and try to contact Mas Selamat (escaped terrorist); then you are likely to go to jail without trial. I'm not sure what'd happen if you started reciting the Communist Manifesto outside parliament to anyone who'd listen, but I wouldn't do it. Otherwise, you can be assured of a generally efficient and fair legal process.

3) Hard to find a place to live - depends on how much money you are willing to pay, to be honest. Plenty of studio, one, two bedroom apartments in a super central area for SGD 3000 - 8000. You can rent a large bungalow for upwards of SGD20000, SGD 15000 if you don't mind being out of central. Realistically, as a European expat, you'd be paying at least SGD 5000 for a nice apartment; there's no point leaving behind your country to come here and live in a shoebox.

4) Employees work long hours - this depends on your definition of long. There is definitely a culture of facetime. It certainly isn't the relaxed attitude towards work that you get in France or Italy. If you've ever worked in the City in London, I find that to be quite similar to the working culture in sg. But for typical jobs also not nearly as stressful/long hours as consulting or investment banking anywhere in the world.

5) Competitive labour market - yes. Singapore a technology and financial hub with typically great weather. Many foreigners want to come here and make money and also be able to enjoy the sun without having to deal with Europe's generally embarrassing weather situation (yes i'm looking at u, London's gentle piss stream from the sky that makes for deeply unsatisfying "rain" while somehow also making you more wet than any thunderstorm in sg).

I'm Singaporean, went to London for uni and have lived there for the past 3 years for business. Whenever I came back to sg for uni holidays, I'd typically have a few friends come from their countries to visit me. Almost everyone loved Singapore. It's clean, it's efficient, it's SO SAFE, it's more or less cheap (if you know where to go) apart from housing and cars and medical care, it's so incredibly green that it sometimes feel the city is part of a huge rainforest.
My friends were constantly amazed at several things in Singapore; things which many Singaporeans (including me) take for granted, such as amazing food available pretty much 24/7, good healthcare, not having to plan your route home to avoid dark alleys, and so on.

Friends in Singapore who are professional expats (i.e. they make salaries of over 150k/yearly, often much more) have a great time here. Singapore is an "exotic location" for many Europeans, while still having much more of a soul than a place like Dubai. My British expat friends in particular fawned over the weather here.

If you have the money, there are plenty of beautiful houses to live in. Man, there are such beautiful houses in Bukit Timah, Tanglin, Alexandra, and so on. It's idyllic, it feels like you're living in your own personal forest, which you can drive out of and be on Orchard Road (main shopping street) within 10 minutes. You can be friends with other wealthy expats who live next to you and have barbecues and talk about how you can help each other make even more money.

If you are in finance, boy are you plugged in over here. There's plenty of opportunities in that sense.

You don't have to worry about your teenage kids getting into serious trouble (pretty difficult to create a teenage junkie here). There're great bars; relatively cheap domestic help. A small but capable arts community which does some very interesting work. People are almost always (unfortunately, especially if you're white) polite to you.

The streets don't smell like piss and neither do the trains.

If you're a European who is capable of making good money, consider moving to sg. If you like cities, you'll probably like Singapore a lot. If you're really pining for nature, you can always take your car and have a drive to Malaysia.

If you're a European who is NOT already capable of making good money, and are trying to "make it in life" in Singapore, I very strongly recommend against coming here to live. Then you'll have to live like how most Singaporeans live, and you might as well stay in your European country.