It is all very well saying men must look out for their own, it is true it is men that do these evil acts, but what to look out for? Misogynistic men who are unpleasant about women are not men I chose to spend time with, there have been three over the years whose behaviour I found fairly repellent, I didn't want to spend any more time in their company than was absolutely necessary.
The police didn't know they had a killer within their ranks, as I understand it they authorised him to carry firearms, surely a role where profiling would be of the utmost importance. Yet they didn't know they had a killer in their midst.