Nobody commits suicide because of rejection, neither from parents or lovers or friends or gods. They just do it, because their operating system fails. It is a fluke. It is not a decision, it is a brain malfunction.

It looks to me like we haven't pinned such a complicated matter down yet, certainly not for all cases. Is it possible you may be over-generalizing from a few sad personal experiences?

Neither the deceased nor their family or friends are to blame. To do so is just unfair. ... [Suicide] just happens, like cancer.

Most types of cancers have risk factors. So does suicide. There are factors that appear to make it more likely. Parents, more than anyone else, are responsible for their childrens' welfare. Parents can increase suicide risk factors by their words and actions, just like they can increase their childrens' chances of various diseases by not providing a healthy variety of vegetables at mealtime. It's not unfair to point that out or to be angry at those parents.