The advantages of realism: 1. it works.
The advantages of Idealism: 1. it feels nice at first, 2. the abstractness and universalism is beautiful, 3. when it fails, you can construct arguments that shift the blame onto realists: "the utopian egalitarian society failed because the realists specialists left to go to another, non-Idealistic country"
The one thing that scares the hell out of Idealists, ideologues, rulers, political groups and so on, is No Cure, No Pay. Or maybe even better: no cure, paying back with interest all funds, serving jail time and - this REALLY scares them - being held accountable to the policies they proposed for us all.
How many oligarchies have been held responsible for the NET EFFECTS of their policies? Logically, systematically, completely, publicly, in a just manner held to account.
Would you allow doctors to operate on you, doctors that do not take an oath to do no harm, have no professional discipline, and do not guarantee any treatment or cure? But you allow political correctness high priests to dictate Ideals the NET EFFECTS of which they are not held accountable for. You allow unaccountable political agents to feed at the troth of public wealth while implementing Ideals the NET EFFECTS of which they are not held accountable for. You refuse to pay the constructor that builds a slightly faulty wall, but you let the great Idealist destroyers of civilization get away with murder. Mass murder, slow or fast, premeditated or acted out in a Idealistic trance. It all has the same NET EFFECT.
An idealist reacts to reality with thoughtstop, fear, ridicule, aggression, hatred, violence, indoctrination and suicide. Idealist groups work hard at novel and improved ways of group suicide, be it by small things such as shutting up about something because it might offend, or in big ways such as marching off to slaughters named "The War To End All Wars". Can we get our money back if it doesn't turn out to end all wars? No? Ok, I'll just dig my own grave, oh I mean trench, join in in the mass group suicide, and write a note to my family that they should never question the motives of our beloved leaders.
Realists: Hey, your last Ideal wreaked havoc on us common people, what have you to say for yourself!?
Idealists: Ach, forget about that, we have a brand new Ideal for you. Better than all those old and outdated ones.
Realists: Will you vouch with your possessions and person for the validity of this Idealism?
Idealists: Ah... Why so cynical? Look at the bright colors.
Realist: Do you agree to paying back public funds if your Idealist policy fails?
Idealists: ...
Realist: Do you agree to be locked in prison if your Idealist policy cause large-scale destruction?
Idealists: I... don't really...
Realist: Do you agree to be put to death if your Idealist policy causes massive human suffering?
Idealists: Hey, you are not one of us Idealists!
