Well it comes down to their hormones, progesterone and estrogen not testosterone. By the numbers, put two sets of progesterone and estrogen in to the relationship and it's a toxic stew that will boil over, nearly 75% of the time.
For years, since 2015, many some ex-Muslims who have warred the western countries of the nastiness of these Muslim men which is the outward sign of the consanguinitation of their minds towards western women. In that broken mind they will commit more crime.