Yeah, suicide is a coward act. But it's better if the person commit suicide rather then go out and be a robber or killer or any other criminal acts.
At least the liability has gone.

Well would u rather invest on the funeral or letting the person went robbing people or commiting assaults or maybe kill a person?

That's why those people committed suicide.
They know that if they continue to live, they will end up doing robbery, killing, rapes and many more.
They had actually sacrificed their life for others..