When we meet a person for the first time, how can we say that it's a pleasure to meet them, when we cannot predict the outcome of that meeting. What if it turns into a melancholy state ?
closed as primarily opinion-based by Centaurus, jimm101, Hellion, Janus Bahs Jacquet, MetaEd♦ Oct 20 '16 at 18:46
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Pleasure to meet you is a fixed expression, which means that you can use it even if it doesn't make sense when its constituents are taken literally. Don't worry, no one will think you are a liar if the meeting turns out bad.
Many greetings in English are fixed expressions. For example, you can say good morning even if you are having a bad morning; in fact, it's usually socially expected of you to use an "optimistic" greeting rather than an honest one.
Well as per my point of view, I think it's an optimistic approach hoping that the meeting will go well and it will be a pleasurable time for both the parties just like they wished each other