In practice the tool doesn't have any blame feel to it. When I commit code that causes problems Squash correctly identifies me and lets me know what to fix. And when I was mistakenly chosen I'm still a good candidate for triaging the bug and sending it off to the appropriate developer.

The emphasis is on finding someone who can either fix the problem or knows someone who can. The idea is that when you get an email from Squash, you should pay attention and respond immediately, rather than getting thousands of emails that you don't really care about.