You would have a point if we were talking about farmers growing staples to feed the local community, but we're not. We're talking about farms that are growing

You would have a point if we were talking about farmers growing staples to feed the local community, but we're not. We're talking about farms that are growing luxury crops (such as grapes, pistachios, almonds) for export. It's perfectly reasonable to ask if this is wise to export water intensive luxury crops in a state that's experiencing shortages.