Avoid is probably too strong a word - it's not as though they are actually dangerous.
It's just that those are relatively small muscles, and training small muscles in isolation is not a particularly effective use of your training time. You are better off working larger muscles with compound exercises - you will get more bang for your strength training buck.
If you do want to train the abductors/adductors, try some compound moves with some lateral instability - eg. single leg squats, T stand/airplane pose, squats on balance board/BOSU, etc.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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