Funny to think of the right viewing the, globally speaking, center-right as “radical left”. The level of hyperbole and hypocrisy from the right is stupefying.
This is a major part of the problem we're in. And I'm sorry but I'm going to "both sides" a bit because there is plenty of blame to toss around.
Democrats and Republicans have both been upping the rhetoric for decades, describing their political opponents in harsher and scarier terms. Most politicians did so understanding that it was all basically just "campaign talk" and not really true. But it gets votes so you do it. You can see this when you see retired politicians giving interviews where their language is much softer and reasonable than when they were in office.
Republicans turned it up to 11 quicker than Democrats though - and Donald Trump and his followers actually believed the rhetoric rather than understanding that it was just campaign BS.