We could stop border crossings today by fining the shit out of American companies that employ illegals.

To some extent, true. However, mowing lawns for cash here is better than no job in Mexico. So, you also have to get all of the individual people who employ illegals as manual laborers, nannies, and maids on board.

"But conservatives won't do that ...."

When have liberals tried to do that? This is a national issue that neither party wants to address. You can't be blind to the sins of one party and lay all the blame on the other. If you do, you've made a bad faith argument.

"it would mean punishing wealthy white businessmen"

Well, it would mean punishing all businesses, regardless of the color of the owner.

The rest of your post is just hyperpartisan nonsense.. You're not making sense.