You are missing the point. I don't have any problem with deleting the emails. When I delete them, they stay deleted. They don't reappear.
My problem is that I get a lot of emails every day and I was looking for a way to delete them en mass. I have two jobs and a work email for each, and two personal email accounts. On my Blackberry, in the 'All Messages' folder, they were grouped by day, with a heading of each date. I could click on the header for October 11, 2012 and delete everything on that date and earlier. On the Iphone, i have to swipe every email, or open edit and press the little circle for every email to delete. I am very surprised that Apple could not find a more elegant way to delete emails other than one by one.