Since I specified politicians not those that support them your false equivalency fails
No. You said:
"A nation should not survive for example if they don't believe in values like free speech or in capitalism"
"Then you may ask. What about temporary restrictions in freedom. Then you temporarily lose your right to exist and when it comes time to expand freedom, those who restricted it, even if it resulted in saving the country should be executed for treason."
So again, running from your own words.
But anyway, whats the difference? If reducing freedom is a crime which deserves to be punished by death, why would you limit punishment to politicians? You would still anyway need to fight the masses which support them. So if masses support reducing freedom, which in many cases is the case, much more often than not, you would have to fight them all.