I could try to explain it to you, but there would be no point. You will believe what you wish to believe. Hope you never find yourself in my situation. The fall from your high horse would probably kill you.
If you remove a feeding tube from your mother who is still able to digest her food, you will be STARVING her and she will die an unnatural death.
I would urge you to rethink your position. You may later regret it. I pray that you change your mind.