I dont think MAGA was astroturfed to combat grassroots nationalism, I just think it was a legitimate nationalist movement that formed around a flawed candidate vulnerable to jewish influence, and as a result ZOG easily co-opted it by deceiving the leader. Its a reverse of OWS in a way, instead of subverting from the bottom up, they subverted from the top down.
They did the same thing by marketing "new" and "trendy" democratic politicians after occupy Wall Street made the left angry, with resounding success.