Does there exist an acceptable manner for someone in a position like his to pursue such an interest? I'd imagine it would depend a lot on the context -- for example, it seems clear to me it would be very inappropriate to do so during any time period where a deal was being negotiated.
And of course, general etiquette would obviously apply, e.g. get to know them a bit and cautiously begin displaying some interest, making sure they seem receptive, etc.
I am genuinely curious about people's thoughts. Not hoping to start an incendiary discussion.
EDIT: I guess it wasn't clear enough that I'm not trying to defend or rationalize Justin's actions in any way. I wasn't trying to explore why exactly what he did was wrong -- that seems pretty clear enough. I was hoping to discuss more ambiguous scenarios.