ok.... I'm confused... do you like the Droid or not?
Now, for your issue: Are you trying to delete multiple emails from your inbox? Or, are you trying to empty your trash can? There is a difference.
Another important question, why are you deleting the messages? I come from a Blackberry background and I'm very familiar with system slowness / memory management / cache and memory cleaning / etc. So, I totally understand the desire to clear out old messages that are bogging down your phone - is that the issue? If so, then the question should be, "how do I free file free memory?"
If you, like me, just don't like NOT being able to do something and want better control of options - I understand.
I may offer a suggestion to quickly fix this issue and avoid having the problem later. Access your email thru your regular PC. If it's yahoo, gmail, or even thru Outlook it'll be a snap to select multiple (even hundreds) of emails and quickly delete them. I agree - it's a pain in the neck to select and delete individual emails on the Droid. I know of no way to select multiple messages (like Blackberry). NOW, once your inbox is cleaned up, just delete them after you read them to avoid the inbox getting so full in the future.
OR..... are you saying that you have in fact deleted them (perhaps in your inbox on the desktop version) and they are STILL showing up in your droid's inbox? Is this the combined email inbox? one particular email server? old messages? outbox? trash? spam?
Also, based on your little poem, you seem to have an aversion to what you consider useless and silly apps. I agree, many are pointless. But, I find it ironic that you detest apps, yet immidiately consider a solution by way of an app before even considering user error or desktop inbox management. Perhaps you would derive benefit from more system knowledge, more use of the "delete" option once email is read, and more informatively stating the nature of your problem as it appears that the responses to your query are confused as to what your issue is.