I am expressing an opinion here but I don’t think that the current crop of Mexicans, Asians, and ME’s have any intention of assimilating and becoming Americans as did the pre WW II and immediately after WW II immigrants. At least I have not seen evidence of it, like learning our language and flying our flag on holidays etc...
The whole reason for the immigration act of 1965 was to justify this sort of domestic spying. When you import that many disparate groups that refuse to assimilate you create Yugoslavia. And Yugoslavia needed a Tito to keep the peace.
It becomes inevitable.
Use of this domestic database for political purges and personal gain is a guarantee. Humans are weak that way. Especially politicians.