Proposed addendum to the policy
Per my discussion with Shadowcrest, found here, and per us once again clashing about this on his RfB, I think it is necessary to attempt to reach a consensus and implement a policy regarding infinite blocks.
Of course, at present it is specified that the length of a block is at the discretion of the admin, which is the way it should be, but as Shadowcrest rightly points out, infinite blocks should be treated somewhat differently. My proposal is to add a section on infinite blocking, which I would have it read as such:
Infinite blocks
In the event of repeated policy violations, despite consistent warnings and with at least 2 prior blocks, an infinite ban can be administered. Infinite blocks may not be administered to users or IP addresses without a warning of an impending infinite ban, and at least two prior blocks of any length. This policy does not respect policies regarding infinite bans of proxy IP addresses and unacceptable user names.
These are the sole criteria for infinite blocking. No presumption about the motivations of the IP address or user will factor into the block, as it is exclusively the conduct displayed by the offender that is used to determine the length of the block. Once the criteria are met, the administrator is not obligated to administer an infinite block, but he/she may not until the criteria are met.