I think the last reason is illegitimate, because it is symmetrical with the existential risk case. Just as voting justifies following politics, so does trying to decrease existential risk justify soaking up X-risk information. Therefore, someone who accepts it as a reason to vote should accept it as a reason to try to mitigate X-risks.
Related to: Voting is like donating thousands of dollars to charity, Does My Vote Matter?
And voting adds legitimacy to it.
Thank you.
#annoyedbymotivatedcognition