Assuming that immigration is “the” real problem (jobs, safety, and so on). Why would facism be “the” solution?

I could skip the discussion on wether migrants are here stealing jobs. In fact, I’d rather focus on discussing solutions. The extreme right is capitalizing on lefties caught on arguments with their narrative. If we agree on the issues (that is, partially) perhaps, could we work together? And I don’t mean with the fascists, but people. We need not to alienate those that consume their propaganda.