would anyone commit suicide with the intention to hurt (sadden) someone?

Yes.

Look at all these school bullies who bully students, only for that student to commit suicide and blame his school bullies.

Yes it could be seen as some type of revenge in a suicidal persons eyes

Yes maybe.. especially when your broken hearted, you want to die and see how will he/she suffer

Yes, it’s possible

A mental illness that is untreated causes people to do unthinkable things.

Sure - never forget - suicide is murder. Homicide. You have to be mad enough to kill in order to kill someone. Who the eventual target is is somewhat arbitrary.

they did it because they had no other choice they want to escape from the painful world they are in.
retreating you see

THAT is the most common motive for suicides. "...You'll be sorry when I'm gone...."

Yes i think so

hi