So you saw the cockroach and ate the food after you left.
if there were cockroaches in the bathroom...it's not a stretch to think they were in other areas including the kitchen. I think I might have thrown it out and just kept the fee.
But then you could face a dirty place if you go somewhere else too. That is the risk to eating out. We don't know how clean their kitchens are. Take Chipotle for example, while we can see the food being put into our burrito or bowl in front of us...we cannot see what is in the back. Any place we dine at has this risk...and I seem to dine out quite a bit...so I guess it's an inherent risk I am willing to tolerate.