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.