Several years ago I realized that blaming people who worked in my department was eating up a lot of time and generating a lot of bad feelings, which was then interfering with productivity. So I changed it and we decided to solve problems and not worry about blame.

Worked like a charm. Oh, sure, there were some problems, and when someone was identified as a source of problems I had to deal with them. But overall I found it to be a great idea.

Try it.