Let's say you have a web page and you write a "hit counter" for the site that tracks how many people have visited it. You discover a bug in the hit counter – it's counting 1.5 times as many visits as it should be counting. You have a few options for how you could solve this:
You could ignore the problem.
The rationale here would be that your site isn't very popular and so it doesn't matter if your hit counter is lying. Also, it's making your site look more successful than it is, which might help you.
The reason this is a bad solution is that there are many future scenarios in which this could again become a problem – particularly if your site becomes very successful. For example, a major news publication publishes your hit numbers – but they are false. This causes a scandal, your users lose trust in you (after all, you knew about the problem and didn't solve it) and your site becomes unpopular again. One could easily imagine other ways this problem could...