I think that “traditional” is the key word here - and in Catholic tradition, you would be correct. I am a practicing Catholic and, although I certainly don’t speak for anyone but myself, I prefer to assume that a suicide is an act of mental illness or defect which can severely limit or even eliminate one’s ability to make accountable moral choices. But the Scriptural quotes to the effect that ony “blasphemy of the Holy Spirit” is unforgiveable are, from my reading, accurate. Tradition and Scripture don’t always line up and, when that happens, Scripture is what I go by.
“The God I serve is a forgiving God. The men who killed President John F. Kennedy and Dr. Martin Luther King Jr. can be forgiven. Everyone can come to the mercy seat and find forgiveness and acceptance. But, and this may be the essence of my argument, suppose one is so hard-hearted and so in-different to life until he assumes that there is nothing for which to be forgiven. What happens to the mind of a person, and the moral fabric of a nation, that accepts the aborting of the life of a baby without a pang of conscience? What kind of a person, and what kind of a society will we have 20 years hence if life can be taken so casually? It is that question, the question of our attitude, our value system, and our mind-set with regard to the nature and worth of life itself that is the central question confronting mankind. Failure to answer that question affirmatively may leave us with a hell right here on earth.”