Be honest, what do you think tagging people for ICO bumping is going to achieve? Their goal is to cause ICO threads to be on the first few pages of the ICO sub. These accounts are not used (to my knowledge) to trade. If anything, tagging these accounts gives legitimacy to someone trying to sell these kinds of services to someone using these services from a particular person.
I am strongly against any ICO bumping service, but this is something that needs to be dealt with by the administration.
Correct me if I'm wrong, but I think that many accounts which involved in ICO bumping services are also used to participate in bounty campaigns. With red tag they wont be eligible for most of bounty campaigns here, this is why they should be red tagged.