What does seem like something the federal government should be doing is mediating issues like this between states, without picking a side (of course, that is easier said than done given polarization in politics currently). Rather than giving us watered down one-size-fits-all policies that nobody likes, or worse yet, deadlocked at no policies or the churn of policies being implemented and then repealed over and over
Of course, it's also not going to happen because proportional popular vote will strongly favor one party...
If we let states have more power, they may enact good or bad policies that others cannot as easily enjoy or escape because of their financial or family standings prevent them from moving. National policies allow everyone to benefit from good policies.
While this is true, the reality frequently seems to be that no bold policy is made or maintained due to polarization or perceived risk. Isolating policies to places willing to try them out is a better outcome. If the policy seems valuable, more states will adopt it
And if you have bad policies nationally, it’s even harder for those less privileged to escape them due to things like immigration laws, costs, language barrier, xenophobia, etc
What about illegal?
I reassert: voting with your feet is a privilege.
For illegal immigrants, I would say that if successful in crossing the border, they are in a more privileged position compared to their compatriots who did not. Not more privileged than citizens or legal immigrants here, though, that's for sure.