It’s not a design flaw. It’s a device with known limitations. You’re blaming the car for college graduates not wearing seatbelts. Maybe our 3rd world folks by not having grown up in a world where these things are second nature actually bother to follow the instructions better.
Then perhaps we shouldn’t be giving them condoms at all if condoms are so ineffective.
If you built a building with a 20 percent chance of expected failure rate during normal (and not extraordinary usage) how long would you work as an engineer?