this is one of the least obviously interpretable bar charts I've encountered. there's definitely lots of information, and the bars are labelled by specific incidents, however there isn't any title or caption for the entire thing, and it seems to be two related plots placed together.

I recognise the names of the more famous politicans so I'm guessing it focuses on shooting incidents against politicians. Do you have any source link that includes the author's interpretation for the data?

My best guess is "Politically-Motivated Shootings"; it's also a little problematic because the number of deaths probably includes people who might not have been the primary target of a politically-motivated shooter. In general I don't like this kind of data presentation because although it does show some statistic about the cohort in question [violent fringes], it doesn't tell you much about how that cohort fits in to the larger population.