Multiculturalism is wholly incompatible with our Constitution, as it replaces a shared morality with a morality of the lowest common denominator-
No, just a shared morality that lets people do what they want if it doesn't hurt anybody. I know why you don't like that though. You want to be free to hurt people.
which is essentially a society without any moral values at all.
How do you get from there to here?
A diverse culture is fine as long as it preserves a religious faith in the power of each individual to command their own destiny.
Is that right. Why do I get the feeling that if you were in charge I'd quickly discover the boundaries of my destiny's freedom?
People like to forget the flip side of government charity, but everything the government gives one person, it must take from another.
I'm fine with that, if it means taking from the likes of Jeff Bezos and Elon Musk. Rob from the rich and give to the poor. Robin Hood had the right idea.
The belief that it is moral for some people to live off the efforts of others – that it is not acceptable for able-bodied adults to have to work for their own survival
Lol. The only people I'm aware of who believe it's moral to live off the efforts of others are ulta rich megajerks like Bezos and company.
– is incompatible with our Constitution
Leaving aside your misleading characterization of social spending. Congress has the power to tax. Congress has the power to spend. Point out where in the constitution it says it can't be on social programs. This is about law, not morality.