But in Mail, the Trash button makes you confirm the deletion. You'd have to accidentally press the 'Trash' button, and then accidentally press the 'Delete Message' button too (which is bright red and a whole inch away from the Home button).
Not necessarily. There's a setting which makes the Trash button delete without asking confirmation. Not sure if it's on by default.
Thank you. I have "Ask Before Deleting" turned off. I am also unsure what the default setting is. Nonetheless, Apple should not put delete buttons near the most-used button. Especially on a touchscreen with zero mechanical feedback.