The problem is not being ignored. The developers have already worked out a way to whitelist certain users, at least for editing if not yet for account creation. Better solutions and alternative approaches are being discussed at http://meta.wikimedia.org/wiki/Proxy_blocking
If anyone does have any real solution to this issue - one that doesn't involve allowing vandals to edit freely - I see no reason why the Foundation couldn't fund the development of such a solution. Perhaps looking into this might be something the new Research Network (http://meta.wikimedia.org/wiki/Wikimedia_Research_Network) could do?
If there is a problem with the information given to blocked users, which as far as I can tell makes no such suggestion that the user is a vandal, then this can be edited by any admin at [[MediaWiki:Sorbsreason]] and [[MediaWiki:Sorbs create account reason]]. As I wrote at [[m:Proxy blocking]], it may be better for that message to direct users somewhere they can be whitelisted rather than sending them to SORBs if they are unable to change the fact they're on an open proxy.
Angela.