The industry average is ~ 10 to 20 bugs per 1k LOC and it's probably fair to state that bitcoind has more lines of code than a small web-based exchange, like Poloniex... 
All of the finger pointing needs to stop and the community needs to help these exchanges get better.
All of the finger pointing needs to stop and the community needs to help these exchanges get better.This isn't a "bug", it is a fundamental flaw in how financial data should be processed. Mike was being truthful when he said it is "database 101". It wasn't that the site used transactions to ensure that withdraws were ACID compliant and there was bug on an edge case which resulted in them not being so. There was no transactions used at all. The proposed solution was more broken design (as opposed to just broken code) to check existing broken design.
The exchange WILL be robbed again. It is merely a matter of when not if.