A lot of "why TF would anyone you do this?" questions can be answered with variations like this. Borrowing from economics, the discount rate defines how much more valuable something is RIGHT NOW vs at some point in the future. If the system is down and we're losing money by the minute until it is up; if the company will be broke next week unless we make customer X happy; if you have to get to the airport in 2 hours - it is completely rational to make the quick fix. The costs of not doing so outweigh the costs of doing it again properly.

It really becomes a problem when the same short term calculation becomes the standard - you can quickly rack up costs that future you or future company will never pay down.