crime rate

I did a little research at http://www.citydata.com to see if I was crazy or not. Glad to report I'm not.

I compared 6 cities in the area to come up with these figures, Davenport, Cedar Rapids, Moline, Rochester, Minn., Kenosha, Wisc., and Columbia, Mo.

The population of each in the year 2,000
Davenport 98,359
Cedar Rapids 120,758
Moline 43,768
Rochester 85,806
Kenosha 90,352
Columbia 84,531.

Crime Index, the national average is 329.7 (year 2,000 figures)
Davenport-626.1
Cedar Rapids-334.0
Moline,Ill.-297.2
Rochester, Minn.-243.6
Kenosah, Wisc.-191.2
Columbia, Mo.-294.8

Okay, the following is the number of Police and Fire and total full time payroll.
Davenport- 180 full time Police, 25 part time; Fire is 146 full time. Total full time payroll $3,000,229.
Cedar Rapids- 257 full time Police, 4 part time; Fire is 151 full time. Total full time payroll $4,752,039
Moline- crime index 297.2; 109 full time Police, 76 full time Fire. Total full time payroll $1,506,729
Rochester, Minn.- 159 full time Police, 1 part time; Fire, 100 full time. Total full time payroll $3,855,931
Kenosha, Wisc.- 196 full time Police, 31 part time; Fire, 152 full time 2 part time. Total full time payroll $3,338,602
Columbia, Mo.- 172 full time Police, 31 part time; Fire 126 full time, 2 part time. Total full time payroll $3,699,266.

My question is, why do we have the biggest crime rate? I didn't pick the other cities because of crime rate, only size and location.