Portland actually has a high crime rate even with the low crime enforcement rate.

"With a crime rate of 59 per one thousand residents, Portland has one of the highest crime rates in America compared to all communities of all sizes - from the smallest towns to the very largest cities ... Importantly, when you compare Portland to other communities of similar population, then Portland crime rate (violent and property crimes combined) is quite a bit higher than average." - https://www.neighborhoodscout.com/or/portland/crime#description