I believe that people indeed support / donate money for the construction of a ballroom. Consider that many people support Ukraine, the US donated literally hundreds of BILLIONS to Ukraine with nothing to show for it.
That's like pissing away the money. At least Trump will end up with a ballroom.
I can agree that people donate money for all kinds of things
I do not agree that Ukraine money was wasted. Ukraine might not exist right now if the US did not assist
I do not agree that the people would donate millions to build a ballroom for Trump for no return. My default assumption is that there was some favor or ulterior motive involved. If it was truly charity, I doubt it would've been an anonymous donor