OK then, let's change the Law so I can Legally rob Banks, problem solved. You were not missed in your brief absence. Blackbird.
It would be solved if the only reason people opposed bank robbery was because it was illegal. But I've never heard anyone say "I'm only against illegal bank robbers, not legal bank robbers."
The antis who say "I'm only opposed to illegal immigrants, not legal immigrants", are either intentionally hiding their real reasons or simply aren't articulate enough to enunciate them, so in frustration they resort to screaming "What don't you understand about illegal."