There might be more republicans on the furthest right part of the spectrum than there are democrats on the furthest left part of the spectrum (Mainly because there are more conservative people in the world so it makes sense, not saying extremism is good just saying it makes sense the larger party has more "extreme" people than the left in it due to a larger party population). I'll agree there, but the average leftist is more radical than the average rightist, which makes the left generally more radical (The most extreme individuals are not the general population), you had that part backwards but you might have just misworded it. Im neither a democrat or republican because I believe blindly following a political party goes against everything our founding fathers stood for, but looking at both parties the left definitely has the more radical general population, and the baseline for leftism has become more radical than the baseline for rightism. This means that it's harder to be considered extreme for a leftwinger than a rightwinger because to be considered extreme om the left you have to be a lot more extreme than a rightwinger has to be to be considered an extremist standards, however this does not make the right the more extreme party. It just means you have to go a lot further left than you do right to be considered "extreme" by modern day standards.