"...so radical" is an extrapolation on a "reactionary scale" between doing nothing (the Right) and burning down the house (the Left).
The chasm between Left and Right, while significantly far apart, is extrapolated from the neutral (zero) Right sitting in their comfortable apathy, throwing money at it, expecting someone else to "fill the hole", and the (negative) bizarre world of carp from the Left. The apathetic (zero) Right can't or won't take the time to get out and VOTE as an assault against the Left. Shame, shame, shame.
The (positively corrosive) Right though are the WORST as they look like, walk like, talk like, and act like they are concerned, but in reality, are conspiring with the Left and are Right In Name Only (RINO).
Taking the (zero) Right's snobbish and highly apathetic road, throwing money at the Left but not getting their (zero) hands dirty finding other ways (even to vote), has led to the current mess across America. Smart men who bloviate but do nothing are responsible for this mess.
The Left is "radical" because the Right is "pathetic".