Why do people refer to illegal aliens as Undocumented?

Framing a political debate is a legitimate tactic within reasonable boundaries. I don’t see Shodan et al. up-in-arms about the term “death tax,” which is exactly the same political tactic. For the various reasons offered—imprecision, awkwardness of calling a person illegal rather than an act, focus on the actual problem—I don’t think this re-framing is disingenuous or unreasonable.

I don’t think so. Which criminal provision do you think they would be violating?