That’s not an insult to God. I totally agree with what he did. If I get to a point where I am non-functioning and need help to do the most basic things, then I become a burden to others, and I serve no useful purpose. I have no one to rely on in my old age (except me) - nor do I expect others to do it. If I choose to go out, I will choose to go out with my dignity intact. I should be able to choose how and when. Others should not tell me how to live - or end - my life.
What are you basing your assertions on?
If you believe in the God of the Bible, then you have to realize that your life isn’t your own.