Comment by atom_arranger

Breaking and entering is to immigrating as pickpocketing is to taking my stuff.

Sometimes immigration is legal. Sometimes taking my stuff is legal.

There’s often overlap between legality and what people support or oppose, but not always.

“I oppose something that’s already against the rules” is a simpler/easier argument, rather than saying “I oppose the against the rules thing, and some of the stuff that isn’t against the rules currently”. I think that's why people make this argument of "only against illegal immigration". I agree it could be deceitful, taking the easier argument. It’s also not a tactic that works long term though if it just results in the immigration they were against being made legal. A stronger anti immigration stance, legal or illegal, would be a better starting point.

To be fair there may also be some people who a couple years ago really did only oppose illegal immigration but were then exposed to new information, and changed their mind to oppose some or all legal immigration as well.