Yup, it's the Democrats... stats on just one of their many failures to perform and improve the lives of the American people.
Interesting that even BLM, the Black Caucus and the NAACP could seemingly care less, it's not politically correct to blame the Democratic Party I guess even though they're in political control...
2017 Stats | Chicago Murder, Crime & Mayhem | HeyJackass!
Okay...Since taking office, what specific initiatives have Republicans undertaken that can be shown unequivocally to be causal in reducing the incidence of, say, homicide, in Chicago?
I have to ask that question because:
- The Republicans are the ones in power now and have been for over a year.
- While it's politically/rhetorically expedient and easy to point fingers elsewhere and identify what actions someone else didn't undertake and what outcomes their initiatives didn't achieve, the real proof comes from upon one's assuming power, what specific initiatives one undertakes and what specific outcomes those initiatives achieve(-ed).
As shown in the chart below, homicide rates go up and down, thus the mere fact that they are, for any given year, cannot be presumed to be due to any specific actions by the people in power at the time. That said, one can see quite clearly that Chicago homicide rates over the past eight years of federal Democratic leadership dropped dramatically from what it had been for about the past fifty years.

The chart below, which is found at the site to which the OP-er linked, also shows there is variability in crime rates.
2017 Chicago Homicide Trend
As the charts above importantly indicate, the average homicide trend in Chicago from 2009 to 2016 was ~464/year. To match the homicide rate reduction outcomes of Democrats (about a ~25% to ~35% decline from the prior ~50 years) -- be it decline due to circumstance or implementing specific initiatives -- Republicans, more precisely Trump, have a very long road to travel before they can claim anything near the observed outcome that endured for seven of the eight years in which Democrats, Obama, held the WH.