It definitely does make you more fit for government.
If I support opinion X and want it to succeed, I should work hard to ensure that those who support X but don't know when to shut up get ignored, ostracised and removed from any public speaking positions in "my party"; so that in the public discourse the supporters of opinion X are represented by people who know when to shut up - because they will help X, but the cranks (with good motivation) will only hurt the cause.
Similarly, if two parties both support X but one doesn't know when to shut up, then you should vote and support only the other party and weaken the too-radical one.
If I support opinion X and want it to succeed, I should work hard to ensure that those who support X but don't know when to shut up get ignored, ostracised and removed from any public speaking positions in "my party"; so that in the public discourse the supporters of opinion X are represented by people who know when to shut up - because they will help X, but the cranks (with good motivation) will only hurt the cause.
Similarly, if two parties both support X but one doesn't know when to shut up, then you should vote and support only the other party and weaken the too-radical one.