Are we talking about North American kitchens only?
In China, Taiwan, it is so common to see critters everywhere. It is not a big deal.
Personally I don't worry about it. If it taste good and it is a popular spot, I assume that they haven't killed anybody recently. More than likely they the pot/pan they use has been used enough times before me that it will be clean enough for my meal..
Why ruin a great meal wondering about things we can't control?