When your adjustments are complete will we still be able to read the comments of banned users up until the point they began their offending behaviour?

Sadly some users who go off the rails start off with posts which contain useful information or suggestions and blanking out all of their posts can seriously derail the flow of a thread.

I understand the need to not encourage people to start an account and then abuse that privilage by flouting the rules but removing large chunks of possibly useful suggestions has the unintended effect of punishing the users who keep within the rules.

It must be possible to isolate a cut off point and grey out or delete all posts starting from the offending comments?

++UPDATE++

The greying out to the point of illegibility may not be a deliberate design feature as Adywan has pointed out (in the bug section) those posts are still legible in Internet Exploder but they are almost impossible to read in Firefox, Safari and Opera.