100% agree. If the six murder case isn't ever solved, that would be sad - but freedom has a price tag, and this is a typical payment.
Side thought: In the past, a more religious society that believed in some deity could take a little solace in the belief that said deity would punish the "sinners" in the next life (i.e. "Let God sort it out").
As our societies moves towards a more secular view, however, that spiritual catharsis is lost. Only lingering feelings of bitterness, anger and injustice - no ultimate closure. Those feelings are based in FUD, which in this case leads to legal opinions that erode individual freedoms so "people" can get "closure" in everything in life. (Yes, that's impossible - but that's not going to stop people from trying.)
In other words, freedom from religion ultimately (and ironically) leads to less freedom overall.