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Well, for one thing I believe we need stronger unification on a global level, especially regarding civil rights, but that's a much bigger and different discussion.
The way I see it is that this is essentially a civil rights matter, and letting those be decided locally is dangerous. I understand the appeal of "If you don't like it you can leave!", but that's way easier to say to someone than to be on the receiving end of when you're faced with the potential of not being
able to do that or being further disadvantaged in your attempts to do so.
On the topic of abortion specifically, I guess in practice the states that oppose this have been doing a good job of making it almost impossible to access already, but imagine you're in Texas and want or need an abortion. Let's say you want the abortion because you're in no economic position to support a baby, which implies you have little to no extra income. Now, someone says, "If you want an abortion, just go to California!" Okay, so now you need to take time off work and spend what,
at least a day driving there, paying for gas, and do the same on the way back? As opposed to finding one locally if it were legal in Texas? If you can't afford it, it's effectively illegal for you.
And that's just assuming that Texas merely criminalized it being performed in the state. What happens if they criminalize having it done at all, and someone rats you out when you come back and you risk going to jail?
"Just go move to California then!"
Okay, but the overwhelming majority of Americans have like $500 or less in their checking accounts, so how is that going to work out in practice? Just moving to find likeminded people so you can live in peace works a lot better in theory than practice.