You just proved your own argument wrong, above.
It IS entirely possible to think that life is a fluke and pointless. So, considering this pointlessness, what does it matter to you, as an existentialist, if someone commits suicide. Frankly, taking ones life into one's own hands can be considered braver than those who aren't man enough to get over with something that's inevitable, from an existentialist point of view, of course.
That is, of course, if they are conscious of the decision they are making. But we're not all existentialists. Either way, he should not have been caused undue harm by his criminal roommates (and they are criminal for spying and broadcasting porn), and he killed himself because of the fear heteronormative society has instilled within him.