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This applies mainly to small to medium stakes live games, both limit and no limit.

I think it can be beneficial in certain games for expert players to show their hands, either when you weren't called or when you called and were beat, but only if you think it will cause others who don't normally show their hands to change their habits.

Uneducated/inexperienced players will not be able to use the information they gain from you as effectively as you will use the information you gain from them. The free exchange of information will give an expert an additional edge over a table of amatuers.

Obviously this only applies to a table where people are not showing their hands unles they have to. Often at small stakes games players tend to show their hands anyway, so in that game you wouldn't tend to show your hand unless it was for a specific purpose like you think it might put someone on tilt. But in a game of amatuers where hands aren't being showed, I think there's real value in keeping it friendly and showing your hand if it will cause other players to start doing the same.