People who agree would obviously do that instead of killing themselves, so you're just preaching to the choir.

My point is that suicide isn't usually a rational decision.

That depends entirely on your evaluation criteria. Your point is only that you don't want to commit suicide. Other people may.

Most people who commit suicide are not accurately judging their situation, due to a long term mental illness like depression, or often due to a momentary emotional upset. Just because someone "wants" to do something doesn't mean that it would actually serve their interests, and it doesn't even mean that they would want it one hour in the future.