Software bugs fall into three broad catagories, regardless how QA labels them:
1. Insignificant (font size on menu two it 1 point bigger than menu 2)
2. Average - (If you click the menu, while holding down the alt key, a wrong menu pops up), at least 85% of the bugs are here.
3. WTF - (The wrong user is updated if you keep hitting 'save').
All 2's and 3's need to be fixed - you can set priority to schedule which ones to do first, but you cannot ignore them. The error witnessed is often just one manifestation of a bug, the other results from the same coding error could be worse.
We are never going to ship bug free software, but if we know about it before we ship, we needs to be fixed.
The example surprised me, if I have to drill down 20 freakin levels and then the app blows - i'm going to cuss, and cuss loudly (and may stop using the software). I thought the example of the bug to ignore, was going to be an example of one NOT to ignore.