There is good points on both sides, taking one extreme position is what I think is wrong.
The simple reason most sane governments are moving toward centrist positions is because its the only and real progressive state (in the long term) a government can have (it can stand the test of time, ---: others ideologies are short termist and eventually break down)
Extreme leftist -> socialism -> communism: Encourages loopholes that allow lazy people to ride on the back of the hardworking and skilled people. And this is evil
Extreme right -> brutal capitalism (example US): breeds severe exploitation (desperate poor people don't have a choice- accept the slavery terms and conditions or starve to death) and huge divide/gap between the rich and the poor. Example; NY, LA, Seattle... billionaires living side by side with homeless, destitute people. Results in 5% owning 95% of wealth: Also evil
Capitalist style competition is good and needed -> without competition there can be no development. A stale society will end being a depressed society (EX North Korea)
safety net welfare is good and needed, particularly because no government can prove it has a 100% employment capacity and capability
Means testing grants to the disadvantaged and poor is good and needed because it is a fact of life that many generations are trap in poverty cycle and only extreme good luck (happens but very rare) can break the cycle
Model of my Utopian society:
1. Children all over the world would be UN special citizens until they turn 18, then the special status is removed. As UN special citizens they are automatically entitled to free education, free health care, food, water, computer, internet, warm home to sleep at and with job or token business grant when they turn 18. This would ensure no one starts life with a disadvantage and no one is trapped in a poverty cycle
2. All signatory countries (under UN rule) would only be able to have tweaks democratically elected centrist governments-> centre, centre-right or centre-left : thus there would be continuity of the model and no government would be able to derail it overnight
3. Extreme religious practices banned
Flaws
-To enforce - would require some kind of dictatorship from the UN
-Defining the line where extreme religious practices begin is difficult