Because Marco Rubio is Cuban, you have to accept that dichotomy between "unlimited immigration forever" and "voice of a dozen generations" is false. The people in charge who you think agree with you do not agree; they're manipulating you for political convenience, and it's convenient for them for you to believe absolute nonsense so that nobody can reason with you. Nostalgia is a powerful force, so nobody will be able to make your hometown feel like it’s 1999 again no matter what immigration policy they enact.

Another thing I'd encourage you to think about: why do you think that the party in control of the White House and Congress wants you to believe that "the actual political movement with power and influence" is their opponents? Normally one would say that controlling the government makes you powerful and influential. Perhaps they're just very humble and self-effacing, or perhaps they don't want you asking too many questions about why their power and influence hasn't achieved what they told you it would.

Huh? The administration that has an entire police force larger than the United States Marine Corps solely dedicated to immigration enforcement doesn’t agree with me that there is a problem with immigration diluting the voice of Americans already here. Okay. That’s certainly a take that one can have. You should just plainly state your point and preferred policy outcome because when you wrap it up in your moralizing (“I’d encourage you to think about [irrelevant point X]”) it obscures what you’re actually trying to say. I think it’s that this WH is engaged in a vast conspiracy to trick people into thinking that immigration is a policy priority when in fact it’s not. But this is obviously not true.

My point about 1999 has nothing to do with nostalgia. It has everything to do with absolutely no one asking for entire neighborhoods and towns to be turned into impenetrable foreign countries. There is a stark difference between immigration that brought people like Rubio here and mass migration from e.g. Somalia, in terms of scale, context, and timeframe.