The article revolves around a poll showing that people expect that political violence will increase, but this is likely more of a reflection of how terrible people's perceptions are, than a bellwether of actual impending political violence. People are terrible at assessing how willing the other side is willing to use violence. This study from 2021[1] shows that the overwhelming majority of americans don't support political violence, but massively overestimates how willing the other side is willing to.

[1] https://www.pnas.org/doi/10.1073/pnas.2116851119#fig01