[hackeraccount]

The charitable explanation is probably that they weren't thinking much. That they had a skill set to allow them to do this quickly and easily.

If I had the idea to do this I'd have to think about and work on it so long that they obvious reasons why it's not such a great idea would probably occur to me.

Either that or when an idea occurs to me I'm never so hyperfocused on it that I won't take a step back and stop asking myself if I can but if I should at some point early in the process.