Why do counselors try to prevent suicide? | Does "Rational Suicide" exist?

This video attempts to answer the question: Why do counselors and other similar mental health professionals try to prevent suicide? I've heard a lot of different questions over the years about this topic and the overwhelmingly majority of people in the mental health community want to prevent suicide. They view suicide as a negative outcome. However, there are some in the general public and a few in the mental health community that challenge this stance.
I've heard many times about this concept of “rational suicide.” This idea that an individual can rationally make a decision to end their own life. A lot of times when you hear the term rational suicide, we're really talking about a completely different situation than we're talking about in mental health settings. I discuss the topic of rational suicide and explain why counselors work to protect life.