They intentionally confused/obfuscated the “illegal” aspect and subsumed it to “immigrant,” a position from which they could haughtily and self-righteously argue.
If it weren’t for the real reasons: Democrat votes and RINO cheap labor, they wouldn’t have any other reason - illegals certainly don’t bring any substantive productive value with them - only problems and trouble. But the prize for them is just way to damned big! Imagine 50 million new Democrat votes.
At least this has shown us who is on our side and who is the enemy.