If I don't know who the person is, I can either assume it's a kid just being silly, or it could be one of the warrants you mention, in which case, backup is justified. When you have an -unknown- person fleeing, you will assume the worse possible outcome. And we had instances where someone turned it from an evasion to a gun fight or otherwise. And if they just ran to get out of a ticket, then that again is the consequences of their actions. Officer safety is paramount, and I would rather have more units helping me when I don't know what I am dealing with, because when you don't know what to expect, the outcome can be more severe.