Buying vs. taking is basically the same thing, except it makes those who took too much in the first place look slightly better.
Next, the dryness. Yes, we do feel it. Not to the extent of others, but people have to spend egregious sums of money to have their wells redrilled when they feel the effects of drawdown. Now, all this water does make its way back into the system. Y'know, basic water cycle and stuff. But what happens when you take it out of the system? It's... gone. And doesn't come back. Water that worked in a system for thousands of years suddenly moves away, drying it out. And to what? An out of control system that's burning up all the water it can get its hands on? Rather than having one fucked system, you'd be creating two by delaying the inevitable.
Now, let's look at real solutions rather than simply saying "They have too much, give it to us". The solution isn't to shuffle numbers, or stick it to farmers, or to say "I want that, give me that." Stop the zoning, invest in infrastructure to maintain your water, or other processes that don't burn other systems. Encourage growth to other areas that can maintain that kind of population, not to a desert that has completely outgrown its bounds.
As for the infrastructure and traffic, the power just went out again, I'm not sure my UPS will last for the rest of this post, and I have to go get my wheels realigned. It isn't a picnic here either.