Isnt it selfish to prevent some one from committing suicide?

because those people are being selfish about leaving everyone whos cares about them or even needs them. i guessss u have a point but to me with suicide people are being overdramatic or dont know how to be optomistic and dont take the time of day to even try to make their lives better, they just wallow in self pity, and i guarantee all of the people who have committed suicide whereever they are if they had the chance would go back and not do it.