I'm planning to stab the woman with a knife in the backyard.
Why would you want to stab someone with a knife?
I want her dead!
You do this, and you are a murderer. Unless this woman was in the middle of attacking you, don't stab her.
It's fine! She deserves it, besides there will be a lot of people around so I won't get caught.
It's not okay to stab someone. And if there are a lot of people around you are more likely to be caught, not less. It's a bad idea all around.