The following graph shows the percentages of respondents, with the 13% answering “don’t know” excluded, who express a favorable opinion of the people who trespassed into and vandalized the Capitol Building on January 6:
Overall, for each person with a favorable opinion, six respondents express a negative one. Not as widely despised as 9/11 obviously, but a very unpopular event nonetheless.
Something that has been a recurring theme here is how supportive younger Americans are of political violence. The riots over the summer of 2020 made that perennial observation trenchant. Here it is manifesting once more. Cross tabs aren’t publicly available, but white men without degrees and Republicans, the other two relatively highly supportive groups, do not skew young. This makes the high aged 18-29 figure the more remarkable.