All I know is that activism is slowly replacing reason on the left
While that may be true, activism has already replaced reason on the right. Both sides demonizing each other and glorifying themselves, as though either side has a monopoly on reason, to the detriment of reason itself.
Consider that Rush and Hannity cater exclusively to the right and have done so for a long time; and how many on the right are quick to defame Obama or Hillary, but are extremely hesitant, or flat out refuse, to oppose Trump’s views or actions (except in secret) now that he’s the president.