My younger 14-years-old self is what first came to mind, because I remember it as a period of my life during which I used to call myself "happy" - even if I view that differently now. I was a professing Catholic, primarily because of my family (went to Church, prayed every day, said lots of "thank you" and "please" in my mind, and felt guilty a lot) - but still, against everyone I knew in my small and close-minded social circle, I strongly believed that suicidal people would not deserve to go to hell.
In the same way that I did not believe that members of the LGBTQ+ community would go there, and that women had the right to have abortions. Needless to say, I lost my faith during a long period of suffering from mental health issues, and became agnostic in a couple of years.
Before becoming suicidal myself, I had met people who wanted to end their life and had confided in me. It was a difficult and uncomfortable position to be at first, but I would have given my own life in order to save them - even when it came to perfect strangers.
Maybe as a kid I didn't think about this kind of stuff, while dealing with own mess, but at the same time I had no reason to condemn it either.
Maybe I've always just been an emotional and highly sensitive person.
The only change I can perhaps recognize in me is having switched to pro-choice, when things got heavier for myself.
I have always tried to empathize with people, sometimes feeling their pain as my own even without doing it on purpose or when I couldn't do anything concrete to help them. Over the years, however, the way I have tried to help them has changed a lot; and the most recent of all is the following.
I became extremely familiar with to the subject of suicide and other heavy topics, so that I could carry both my own and others' - without them weighing me down. However, if before I wanted to ctb my primary purpose was still to "save" or help the person not to die, even if indirectly (and even if I was okay with the concept of euthanasia), now I just provide emotional support.
I just feel like I don't have the right to make decisions for others, and I had to learn the hard way that advice, sometimes, can hurt when not requested.
Back to the original question, @ijustwishtodie, was there a time when I "used to appreciate life so much to where I couldn't even fathom being suicidal and/or the mindset of a suicidal person"? Yes. There must have been.
"If so, what changed to make you understand suicidal people now?" Was that an easy switch? No. It's not that at first I couldn't understand suicide at all, then one day I snapped and was suddenly going to kill myself... I believe it still is, and have always been, a deep and very complicated ongoing process, which may even change again - gradually - over time.
At least, this is my experience. Thank you for allowing me to share it with all of you.