I genuinely disagree with you on the placebo argument, but that is okay.

Sometimes I like an abstract painting or sculpture because of shape, color, composition and so on. I don’t think abstract art would be popular with many people is the works didn’t stir something in them just by how they looked.

Again, I completely respect that this type of art doesn’t do anything for you, but I think you are entirely wrong in claiming that there is nothing to abstract art unless there is a title for context. That isn’t true. Abstract art can evoke all kinds of emotions in people without any context. Disgust, euphoria, sadness, happiness, fear, anger, calmness etc. It is not a trick that an abstract art piece can evoke emotions. It is simply a matter of the art piece being created by someone who has an eye for composition, color theory and is in tune with the emotion he or she intents to transfer onto the canvas.