This is a big and complex topic, so I'd like to get the most simple/obvious parts out of the way first before I delve into the rest of it.

First, let's look at one extreme where I think we'd all be in some agreement, suicide bomber's/terrorists. They are ending their own life basically for the sole purpose of causing harm on others cause their God/Beliefs say so. This is can very easily be called selfish and left at that, but even this is not that simple since they had to be raised to have such hate/beliefs to begin with. So is that truly selfishness or a sad story of a promising individual who was convinced to end their life because of how they were raised?

Now for the Suicide topic which this topic seems to actually be referencing, suicide as a result of Depression.

I'll go at this from the assumption the person actually has depression, and isn't someone who simply self-diagnosed and is using it as an excuse for everything they do in life.
-Side Note: Seriously, if you're self-diagnosing and using it as an excuse for how you treat others just stop. Now.
I've been at the receiving end of that before, all you do is hurt those who care for you and make things worse for those who actually struggle with Depression.

*Back to being on topic*

Originally I was tempted to say "There is a trace of selfishness, you are choosing to end your life and make those that care for you suffer". But then I stopped and thought of it another way. Depression and every other mental illness is for all intents and purposes a wound, an injury and alteration of the mind. It is not something we can help, and it is a wound that is not obvious like a physical one. 

It is one where you truly need to know a person to know the wound is there, and even then you may not know they have such a wound. If someone were to have a weak heart for example would you blame them? Would you get mad at them for having a wound inflicted on them they couldn't control? Of course you wouldn't. Why should something like Depression be treated any differently?

Depression actually releases hormones that alter the way we think, act and feel. We can't help it anymore than we can help being attracted to someone cause of the hormones we produce, or the fact we have certain interests and things that make us happy. We don't consciously choose "I'm going to enjoy ______ and be attracted to _______", it just happens. Someone feeling suicidal killing themselves is not a sign of selfishness, it's losing what probably was a very hard and difficult battle against a condition they had no say in having or not. No one chooses to be Depressed, no one chooses to be suicidal. If someone had cancer and died, would be mad at them for being selfish and not fighting hard enough to stay with their family? Of course we wouldn't. Both are conditions that are unwillingly thrown onto us, both are conditions that can lead us to dying, both are conditions that cause us to go through a hard battle every step of the way. The only difference they have at the heart of it is that one is physical and obvious, and the other is mental and not so obvious.

Next time you see someone whose depressed and have suicidal thoughts don't treat them as if they are selfish. Treat and respect them the same way you would someone who had another kind of illness that was killing them or at the very least making their life much harder to go through.

[hider=Shout out]Big shout out to Dark Wind.
He was perhaps the main person who let me learn more on Depression and look at it from an understanding perspective rather than one who is quick to throw judgement and label it as selfish. I had gone through experiences in life with people who had Depression where for a while I looked at anyone with it as fakers. Selfish people who only wanted popularity, attention and to avoid owning up to their actions. His words a long time ago had helped open my eyes to the issue being far more complex than I originally thought I'd like to give him proper thanks for that may he be reading this or not. :)[/hider]