Bad setup isn’t a reason why something is a bad idea. Whatever your opinions of cars are, talking about how bad they would be if everyone drove drunk doesn’t really prove your point.

In any security system, and this should also apply to home automation, one of the things you have to account for is failure. If you don’t have a graceful failure mode, you will have a bad time. And context matters. If my security system fails at home, defaulting to unlocked doors makes sense, especially if it’s due to an emergency like a fire. If the security system in a virology lab fails, you probably don’t want all the doors unlocked, and you may decide to have none of the doors unlocked, because the consequences of having the doors unlocked is greater than having them locked. Likewise, but of a much less serious nature, if your home automation fails, you should have some way of controlling the lights. If you don’t, again, it hasn’t failed gracefully.