Private jets are bad and wasteful & the people attending that are pricks anyway etc. etc. Everybody agrees.
But I actually see no issue with the attendees flying in on private jets in and of itself. The impact of all that travel is basically just a drop in the ocean and could easily be made up for with a stroke of a pen if those people would actually convene to do some good. Do you really want your PM/president wasting 2 days getting there? I personally wouldn't.