Requiring a lot of water to grow something isn't inherently problematic. The issues only come in when wealthy landowners steal drinking water during drought conditions to grow things. When it comes down to brass tacks, the cartels are more of an issue with avocado production (and actually one of the bigger reasons they are expensive).

All that to say, it doesn't really matter in the end. If you enjoy your avocados and can afford them, have at it. We're all doomed to be crushed under the cloven hooves of our billionaire gods anyway.