Your own personal God of Curtain-Twitching should only provide advice on the subject of curtains. If he starts to interfere in other aspects of your life you should be wary and seek independent advice. In extreme circumstances it may be wise to change your curtains.
In a life-saving situation it is acceptable for the Curtain-Twitcher to give away their position. The person being saved will be so grateful they will forget to be suspicious.