I’m not sure the “melting pot” was ever a perfect metaphor for America. More true, certainly at first than it became over time, but even in early immigration periods in the 19th century there was always some clinging to home-country culture. The Irish, the Germans, the Italians, the Scandinavians, Croats, yadda yadda yadda... The difference though was they were -determined- to become Americans. They learned English and enforced it with their kids. They were proud to have an American identity. Sure, they all kept some of their homeland cultural traditions and were proud of their heritage, but they were American first. They “melted” into a new alloyed culture and they assimilated the parts that mattered. Not complete melt, but a serviceable alloy.
Multiculturalists want to make us instead into a “tossed salad”. Everything gets mixed up together but all the original bits stay in their original form and remain essentially unchanged by the mixing experience. There is no joining together, no melting, no new alloy... The whole is in fact weaker than the sum of its parts.
A strong structural glue-laminate beam can be made from a large number of small pieces of wood. But they have to be glued together into one thing with one mission, one purpose. A lot of small pieces of wood assembled like a beam, without the glue, will be just a pile of cordwood in the end.
Nice analogies.