[frmersdog]

Because they never actually intend to, in any meaningful way. Trump is the wildcard; he was the first to actually do it, and the result was a lot of people complaining about rising construction costs and a shrinking labor pool. The actual goal for these donors and politicians is to keep a steady influx of exploitable labor to serve as the poorly-compensated, mistreated underclass that most Americans would riot rather than let themselves become; enough so that they always have something to run on, but not so many that they actually have to take action (e.g., when even liberals or progressives start having an issue with it). Same thing with Democrats and abortion.

The "interesting" (in Chinese proverbial terms) part is that we're living in times where a certain charlatan's actions have lead to the big red button actually being pushed on both matters. Whoever wins tonight, it certainly looks like we're about to test if each respective development has any bearing on polls, or if parties can just run on anti-immigration/pro-choice vibes ad nauseum, regardless of what's actually happened wrt each policy over the past (few) decade(s).