Because of the infrastructure that exists. If industrialization had occurred in an era of elevated temperatures (even +5C from now) it would be less of a proble

Because of the infrastructure that exists. If industrialization had occurred in an era of elevated temperatures (even +5C from now) it would be less of a problem. An LA without water is just a desert. Whatever combination of desalination, increased air conditioning, and migration ends up being done to mitigate the effects of climate change is expensive. Really expensive. Unfortunately, many people who are loathe to interfere with the economy via the government are all too happy to decide that they know enough about Caribbean fisheries, rice paddy cultivation in Burma, and civil infrastructure in Doha to say that a government policy that will likely significantly and adversely affect all of them is fine.