User changes the page HTML code on the fly and it works... what?!

Hi,
I have a report region that generates a number of checkboxes using htmldb_item.checkbox. Each checkbox is associated with a date, and what dates are displayed are based on a number of business rules.
The user then can select any date she wants (from the available list) and click "Confirm". A page process will identify the selected checkboxes (using the g_f01 array) and do some processing with them.
For my astonishment, a savvy user found out that, using a plug in like firebug, he could easily modify the page HTML and ADD extra checkboxes to the report, with WHATEVER dates he wanted! When submitting the page, Apex would not complain and would process those extra dates as if they had been sent when the page was generated.
Well you can imagine the potential impact of this... As a workaround, before processing the dates, I re-apply the same business rules just to be sure those are valid dates.
So I am a bit lost here... Has anyone else seen this before? Shouldn't Apex identify that there is extra data in the submitted page and raise an error? Is it my fault, the web platform is so insecure that I should be checking everything everywhere and not rely on the submitted data being reliable?
Any comments welcome.
Thanks,
Luis

Hi, thanks for sending the link for that plug-in, I can't wait to tell my users so they can start using it... :)
I understand that this in a way is due to the intrinsic weakness of the platform (I developed C/S applications for years and never heard of end users hacking Oracle Forms or Powerbuilder applications... at least not that easily)
On the other hand, I think that Apex should offer a minimum of automatic checking... for instance, if a tabular form rendered 10 rows, the submitted data should contain the same 10 rows, not more, not less. In fact that was my assumption. Maybe this is something that can be improved?
Luis

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