I remember some of those, and they were overt and heavy-handed lessons. Trek does it in a subtle way that can even be ignored by the viewer if they choose. Some episodes seem like just regular action stories and then later become disturbingly relevant. "The High Ground" for one.But do show that use allegories or address some relevant social topic still exist? It isn't a 80's/90's thing with tv shows that sometimes broadcasted a "very special episode"?