Why did I write “don’t believe her about the closet” when I knew my son was inside it?

I left my eight-year-old daughter drugged on the floor and my ten-year-old son shut in a closet. I wrote that note for my father, because I wanted him to walk into my house and accept my version before he heard theirs. That was years ago. I still don’t have a good answer for why I thought I could manage what happened next.