I think suicide is a political and revolutionary act, and the common person who commits suicide is a martyr.
Think of all the restrictions to suicide that have been put in place. Religious restrictions to it involve going straight to Hell. Cultural restrictions are abound with people who feel it is their duty, or who simply get feel self-righteous at the mere thought of "saving" someone (notice the language, it is called "saving" someone). Political restrictions involve–if caught before the deed is committed–being put into a prison (a.k.a. 'involuntarily confined,' what a nice euphemism); and then a fate even worse than that is to be forcibly fed psychotropics, because it's better to have a zombie who hasn't committed suicide than a free spirit who has shown the way out. Societal structures will call people who even so much as consider suicide to be "sick." Countries like South Korea are suspected of going so far as to try to hide or deflate suicide figures, which are already the highest rates in the world. Literature that tries to provide methods to suicide are legally banned. In some places, the mere discussion of it can be legally pernicious. Online, this 8chan board is practically the only site that exists that supports suicide to the level it does.
Why all these restrictions? It's the same reason that in countries where levels of emigration are high, that there are restrictions to that. When a person emigrates, they are telling everyone in that society that they do not consent to what is happening in the religious, cultural, and political system there. In response, the holders of power of that country find it necessary to stem this loss of legitimacy and to stop their cattle from leaving the farm. The society calls it 'unpatriotic,' they put up exit taxes, they put up walls to exit. Emigration is a political and revolutionary act against the society at hand.
The people in power are afraid of the possibility of their slaves to commit suicide.
And suicide is a perfectly rational act, as it is a form of personal secession. Viewed as an emigrant, he moves away from the land of the living. He denies consent. He is no longer to be treated as chattel by his government, by his church, by his peers, by his family, or whatever causes him the pressures to commit his act of secession. Viewed this way, the people who attack suicide are just like the house slaves who defend their master.
Those who reject suicide are unable to see the way off of the plantation.