First of all, there is no such thing as perfect or ideal person or system. Flaws are nature, but we have to carve best out such flaws. Muslim had it for a short period after the demise of Prophet(s), till greeds and kingdoms of different kind took over. presently, its the European union, which is trying to give best possible rights and social services to its citizens. Chinese are also working hard in that direction. Oil rich Saudis / M.East have also shared their land wealth towards their people in social sector.
Critiques can still find problems there, but if people are getting good services, food, education, health etc, then its blessing.
Btw, We should not use word "' they"". Its for Aliens. All of us make they, we have to be better individually. It will work for all.
13:31 Our Law precludes the possibility that a Lecture would move the mountains, tear the earth asunder, or make the dead speak. (The Qur’an is intended to move hearts, not mountains 6:7, 6:25, 6:112, 15:14-15, 17:90-93). Nay, all Decree belongs to Allah. Do not the believers know that if Allah had Willed, He could have guided all mankind (by not giving them free will 10:100)? As for the rejecters of the Divine Laws, disasters will not cease to strike them for their deeds, even close to their homes until the Promise of Allah comes to pass. Verily, Allah never fails in His Promise. (Mankind will keep devising various political systems in search for the best. Those systems will keep collapsing and they will keep suffering far and close to their homes. Then, ultimately, they will realize that the Qur’an offers the solutions to all the problems facing humanity 41:53, 51:20-21).