Places like Mississippi don’t have high homeless problems because they lack services and good weather, so drug addicts who have burned their family/friend networks, at least, hop on a bus to somewhere they can survive (usually a west coast city with mild weather and a progressive voter base that is willing to throw lots of money at the problem). That segment of the problem is 100% mobile, and even self reporting surveys show cause (like 60% of king counties homeless population saying they had previous housing in pioneer square).

If you can’t afford housing anywhere, you just won’t survive very long in lots of places, so survival bias starts to show up.