I think the issue is that mainstream media like movies showcases political violence as very well organized and full of manifestos when the majority of these attempts are very poorly planned and the people carrying it out clearly have mental disorders so it's very hard to pinpoint what ideology they are promoting.
I also believe that these recent attempts have showcased that the current political establishment has been doing an awful job at reconciliation and instead pouring gasoline by refusing to make a joint statements condemning the violence or making any sort of gesture that isn't blatantly bipartisan.
If you look at the political violence of the 60's and 70's in the US, there's a lot of overlap but at least the government took steps to not only keep it under control but congress actually took steps in dealing with the hot button issues. Nowadays it seems like we're just kicking the can down the road and blaming the other side for it. I mean just look at the current shutdown and tell me if this state of affairs won't result in further anger and people taking action with their own hands rather than rely on political institutions.