And this last point about enforcement is important, because evidence suggests that, like most ethnic/racial minorities in the US, Hispanics do not demonstrate a collective belief in the civic principles of the US (certainly not to the proportional degree seen in US Whites), but they DO behave as a collective, supporting left-wing political groups in overwhelming majority. Those promoting civic nationalist ideals do not demonstrate the philosophical-willpower to enforce these civic values, have offered no methodology to alter this condition, and all indications suggest they are bereft of such a method - if they were not, the populations which have been in the US for several generations, exposed to the values of the country and civic nationalists' arguments in that vein, would espouse those positions, but they do not.
While on the subject… Why do Hispanics support left-wing groups? Are they actually more left-wing in political view? Yes, but that's not the whole story - they vote as a collective, and they do so to serve collective interests. Left-wing groups in the US are the groups in favor of serving the left-wing predispositions of Hispanics (hate-speech laws, gun control, expanding government with more programs) as well as increased immigration, which they promote loudly, and increased immigration leads to an increase in population for the respective ethnic/racial minority in question, which in turn leads to an increase in the political power, electorally at the very least, wielded by that ethnic/racial minority. Hence, regardless of their political stance, Hispanics support left-wing groups as a collective to serve collective interest. We see the same sort of behavior on behalf of Blacks and other non-Whites.
In fact, we see the same sort of behavior on behalf of Asians, who also primarily support left-wing groups in the US (50%+, increasing generationally), even though polling of their political views suggest they may not actually be left-wing politically - they're merely acting as a collective in serving their collective interest.
Left-wing groups are, for whatever reason (ideology, personal desire for power or wealth, etc), very happy to assist in this endeavor, and in fact, the left-wing political party of the modern US is an amalgam of minority groups acting collectively in their own interest despite an absence of shared political belief betwixt the tribes. They are, effectively, a collective composed of collectives, each acting to serve their own interests, and a great deal of their effort is maintained in securing each individual collective's support and avoiding conflict among those groups where their perceived collective interests conflict. Further, these left-wing groups - aided by left-wing political/social organizations (several particularly influential examples bearing an overt Jewish composition or philosophy) - explicitly advocate for, and support the explicit advocacy of, the respective non-White minority collectives, whilst simultaneously doing everything in their power to silence, slander, demonize and deplatform any and all explicit White advocacy groups through accusation of association with 'racism', 'White supremacy', 'Nazism' and/or 'anti-Semitism', amongst others.