Dear Google People,please help me to understand wh...

Dear Google People,please help me to understand why when I delete emails I then have to go to "trash" and delete them, yet again, to delete them forever. Would it not be more time efficient to simply have the choice to hit "TEMP DELETE" or "DELETE FOREVER" from the very start of deleting emails? I really hate doing things twice. Aren't computers supposed to help people to be MORE efficient with our time? Please tell me the purpose of having "delete" then "delete forever". If having the deletion of emails this way has a purpose , please take YOUR time to explain it to me. If I don't get any answer, then I will have to just assume that either YOUR time is more important than mine, or you just don't have an answer.