Chicago, Murder Rates, and Martial Law

Donald Trump's been tweeting again, this time about crime and implying that he's considering federal martial law in Chicago.

If you look at the most recent crime data compiled by the FBI, you get murder rates (per 100,000 population) like these:

 1  MISSOURI        ST. LOUIS                                 2016  27.75
 2  FLORIDA         ORLANDO7                                  2016  24.21
 3  MARYLAND        BALTIMORE                                 2016  22.05
 4  LOUISIANA       NEW ORLEANS                               2016  17.03
 5  MISSISSIPPI     JACKSON                                   2016  15.84
 6  MICHIGAN        DETROIT                                   2016  15.30
 7  CALIFORNIA      SAN BERNARDINO                            2016  14.78
 8  SOUTH CAROLINA  NORTH CHARLESTON                          2016  13.76
 9  TENNESSEE       MEMPHIS                                   2016  13.38
10  GEORGIA         ATLANTA                                   2016  12.27
11  GEORGIA         SAVANNAH-CHATHAM METROPOLITAN             2016  11.66
12  ILLINOIS        CHICAGO                                   2016  11.62
13  VIRGINIA        NORFOLK                                   2016  11.00
14  VIRGINIA        RICHMOND                                  2016  10.87
15  MISSOURI        KANSAS CITY                               2016  10.77
16  OHIO            CINCINNATI                                2016  10.72
17  FLORIDA         MIAMI GARDENS                             2016  9.69
18  CALIFORNIA      SALINAS                                   2016  9.48
19  PENNSYLVANIA    PITTSBURGH                                2016  9.45
20  NEW YORK        SYRACUSE                                  2016  9.03
21  WISCONSIN       MILWAUKEE                                 2016  8.83
22  NORTH CAROLINA  FAYETTEVILLE                              2016  8.30
23  CALIFORNIA      VALLEJO                                   2016  8.25
24  CALIFORNIA      STOCKTON                                  2016  8.20
25  CALIFORNIA      RICHMOND                                  2016  8.20
26  OHIO            AKRON                                     2016  8.10
27  LOUISIANA       SHREVEPORT                                2016  8.10
28  ARKANSAS        LITTLE ROCK                               2016  8.05
29  CONNECTICUT     HARTFORD                                  2016  8.03
30  CALIFORNIA      INGLEWOOD                                 2016  8.00
31  KENTUCKY        LOUISVILLE METRO9                         2016  7.79
32  PENNSYLVANIA    PHILADELPHIA                              2016  7.78
33  NEW YORK        ROCHESTER                                 2016  7.62
34  NEW YORK        BUFFALO                                   2016  7.36
35  VIRGINIA        HAMPTON                                   2016  7.33
36  OKLAHOMA        TULSA                                     2016  6.97
37  TEXAS           HOUSTON                                   2016  6.94
38  TENNESSEE       CHATTANOOGA                               2016  6.86
39  ILLINOIS        ROCKFORD                                  2016  6.75
40  FLORIDA         FORT LAUDERDALE                           2016  6.72
41  CALIFORNIA      SANTA MARIA                               2016  6.71
42  CALIFORNIA      OAKLAND                                   2016  6.67
43  LOUISIANA       BATON ROUGE                               2016  6.56
44  OHIO            DAYTON                                    2016  6.40
45  CALIFORNIA      ANTIOCH                                   2016  6.33
46  KANSAS          TOPEKA                                    2016  6.29
47  TEXAS           DALLAS                                    2016  6.22
48  INDIANA         FORT WAYNE                                2016  6.16
49  FLORIDA         MIAMI                                     2016  6.16
50  PENNSYLVANIA    ERIE                                      2016  6.07

You can see right away that, at least in the first half of 2016, there were about fifteen to twenty cities with comparable murder rates.

So what's the threshold for the necessity of Trumpian martial law? Why Chicago? Even if the period after these numbers were posted has been particularly bad for Chicago, it remains unclear why Chicago and why now, since there have been lots of cities with worse rates in recent years.

But I suppose Trumpian logic isn't systematic in this way. It's likely more to do with Fox News and its viewership's visceral opinions on "the inner city" in general and Chicago, with its assocations with Obama and so on, in particular.