Reese:So true!
When a person commits suicide, he thinks there is not point in living any more and that the world will be better off without him. It's also an escape from having to deal with the problems and sufferings he has been through. Another reason is, he is no longer in the right state of mind and has lost it. The immediate solution is to just die to set himself free from the mental torture.
Maybe parents can take this opportunity to talk to your teens about suicides and what happens after death (per your beliefs).