The Capitol breach was the seminal event that day. If that didn't happen, it's a "mostly peaceful protest" like the Summer of 2020 was.
The claim was made that Trump's speech caused people to break in. Now we just learned that they knew people were planning on breaking in the day before he even gave his speech. So, besides the idiots who decided to break into the Capitol of their own volition, a lot of the blame for the Capitol being breached is on those who improperly assessed/ignored the security concers.