The headline is erring as it misses that so many in the GOP literally didn't see violence.
You might say that they were mislead or ignorant or frame it however else, but it's a function of the "we live in two different worlds" environment we're facing today, where people operate on different, incompatible sets of facts.
So when the poll asks how people thought of Jan 6th it's critical to realize that people have complete opposite perceptions of what happened that day.
They're not supporting violence. They're supporting their perceptions of the event, which for so many doesn't involve violence in the first place.
That point is critical to interpreting the poll.