Comment by JuniperMesos

It's not exactly programmers failing to take into account that no everybody writes in English - if that were the case, then it would simply be impossible to represent the Turkish lowercase-dotless and uppercase-dotted I at all. The actual problem is failing to take into account that operations on text strings that work in one language's writing might not work the same way in a different language's writing system. There's a lot of languages in the world that use the Latin writing system, and even if you are personally a fluent speaker and writer of several of them, you might simply have not learned about Turkish's specific behavior with I.