pure speculation, but i think there is one group who actually drank the kool aid and believe that humans of all races are interchangeable and that society comes from the top down and will assimilate them into our culture. not understanding that demographics make culture from the bottom up.  another group of technocrats who believe that coming revolutions in robotics and ai will make people obsolete. and probably another group of people who are content to just rule over the remains with an iron fist. they still have the resources accumulated to live very well for a long time, even during a decline. they might even know that it's doomed, but just don't care because they only have 30 years left on the earth and think they can outrun it. some of these people are seriously, seriously self-centered like that. fuck you, i got mine. let it burn now, i'll be dead anyway types.
Canada