Because they’re not being sent to fundamentally transform an already socialist nation, their purpose as a collective is to play a part in making America more socialist. Our leftist leaders don’t hide their intentions to fundamentally transform America. Not sure what the big mystery is on this one, maybe that some leftist will claim it’s for opportunities for work/life in the US, unknowingly acknowledging that socialism kills opportunities, but again that is the staged narrative, the real plan is to change America. Remember all the Syrians who would have assimilated into a ME country but instead were sent to western civilized nations? The puppet masters are far more malicious than you give them credit for.