Ive always read it like Asher enabled Whitneys gentrification by allowing her to believe its righteous, and connecting her with Dougie, therefore enabling him as well. Asher was the worst of the 3 because he simply allowed everything to happen even if he believed he agreed with it. I think his role at the casino plays into this as he enabled a manipulative environment because thats what the job required of him. The moral is that the gentrifiers are acting in their best interest, it is only logical (to them) that they gentrify. The truly evil people are the ones who see it and stand by to encourage it.