What does 'The concern of the suits is touching.'
This is a line from the movie Avatar. I really don't understand this sentence. mean?

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I don’t remember the plot of the movie super well, so I don’t recall what was meant by “suits” in this context. We often call business executives “suits”, but in that movie they could be calling the people operating a Na’vi disguise a suit.

However, “is touching” is a phrase to mean that something seems sweet and or kind to you that gives you a warm feeling in your heart - thus the idea of this scene touching you. “The gesture of a mother hugging her child was touching”. It is a scene that reminds a person of positive or “warm” feelings like empathy, love, hope, et cetera.

So here they are saying that the concern that the suits are expressing is bringing some sort of positive feeling to them.