I don't understand why people have window curtains and close them at night. If you have them closed then you can't see the person spying on you outside. Door locks are more important.
This is what you sound like. The things can be used in conjunction with one another. It is not an or scenario, you can have both. You can also have covers which don't cover the indicator. You use different deterrent mechanisms for different threats. It is as simple as that.