One related topic that I find interesting is how some programmers feel compelled to make a pivotal distinction between "unique" and "practically unique" with re

One related topic that I find interesting is how some programmers feel compelled to make a pivotal distinction between "unique" and "practically unique" with regards to random UUIDs. They refuse to insert UUIDs into a database blindly, even if checking for duplicates implies a heavy performance penalty or even makes scalability impossible. Personally I compare this distinction to something like the odds of the Earth being destroyed by a meteor. It could happen and it would be a disaster, but the probability is so low that I just decide not worry about it. So the interesting question is: Which one is the better programmer, the one who trusts "practically unique" or the one who always requires "unique"?