Going by your definition, living on earth is a suicide mission because as we all know every human will die at some point. Does that mean we all commit suicide?
Suicide missions do not always end in death. Soldiers -they fight wars and they know they may die during battles, are they suicidal? Are they commiting suicide?
Also, refusing to take actions to stop death is not tantamount to commiting suicide.
In your bid to try explain away suicide, you make a lot of assumptions that do not add up and are a bit dangerous