It's not like there weren't homemade explosives found on the site:
> Coffman, 70, told police he had mason jars filled with "melted Styrofoam and gasoline." Federal investigators believe that combination, if exploded, would have the effect of napalm "insofar as it causes the flammable liquid to better stick to objects that it hits upon detonation," according to the court record. [0]
[0] https://edition.cnn.com/2021/01/08/politics/us-capitol-riots...