alt Hacker NewsIt's because you (like me) aren't quite as paranoid as security people are. Personally I couldn't sleep at night if I was security people.
It's really a matter of context. Security people tend to only be involved when things are already nefarious where as boring old normal people like us see get to see the mundane everyday mistakes so not just the nefarious bits.
I'm a security people. I can say with confidence that a tiny, tiny, tiny, tiny fraction of these security issues are deliberate. Almost all of them are just dumb mistakes because making good software is really hard and really, really expensive and there is no market incentive to make good software. You don't need to get hired at the safe factory to build an elaborate back door into the production line if safes are actually just cardboard boxes, you know?
It's possible the backdoor is deliberate, I have no idea in this particular case, but the more likely situation, absent more information, is that someone who is earning a middling wage just added the "feature" and didn't think about the security implications because no one cares about computer security.