For your safety and your family's, I think it's really important for you to be discreet about your husband's involvement in tipping off the police about suspected criminals.
I didn't read all through the thread, but at the time of the first post, at least, the criminal was still at large. I wouldn't want him/her/them to associate the Federal Marshals' visit with a call from your husband.
Yes, I think that it's also important to be a "neighborhood watch" person, but when the axe falls, it's better if it can't be traced back to your hubby.
I think in this day and age, every neighborhood has its problems. I have always lived in "quiet neighborhoods" and my children have gone to "quiet" schools, and yet, my next-door neighbor was stabbed to death in NY (walking to his car from the subway, not in my neighborhood.) My school nurse in a suburban Catholic school was murdered by her husband. We had a crack house down the block (now completely renovated and resold--it's beautiful. PTA parents in my suburban school district--a LI police sergeant and his wife--turned out to be dealing cocaine. Wife turned on husband, claiming innocence (didn't she ever wonder how they could afford their lifestyle?) Husband, while out on bail, went and stabbed the people he believed ratted on him.
All in neighborhoods that real estate agents would tout for their safety...