radicals on the right are socially regressive/reactionary baby boomers (and older) who wanna strip other people of their rights and socioeconomic positions to prop themselves up. they are also the demo thats most likely to turnout to vote and they support candidates who echo their sentiments/policies and even turn out to vote in primaries to punish those who dont. so the repub party shifts as they shift because the radicals actually push/support them electorally.

radicals on the left are mostly young people who bitch and whine all day about how their vote needs to be earned and how politicians are failing to appeal to them. then they sit on their ass when it comes time to vote and get mad at politicians that play to moderate voters who actually turnout to vote at twice the rate of young folks.

bernie ran on a platform that was the most in line with young lefties for a major prez primary candidate possibly ever. how did they thank him? by failing to show up to the polls and win him a single county in important states like michigan and florida. they didnt even show up to hand him a state with a significant lefty primary base like washington.

how are you supposed to substantively be a political force when you dont even care to actively participate in politics?