The facts above are not just strikingly logical but also have large consequences. One could argue that solipsism is a good excuse for arrogance. But this ignores the basic aim, no, wrong word, principle of solipsism. If at all it is a very subtle and hardly attackable nuance of arrogance as an unintended side effect of solipsism. But it has great other potential.
Solipsism is true solace, better than any drug.
But it is also a very dangerous idea. If one gets too indulged into it he might get carried away. If taken very serious and if you believe in it and think about it too much, the effects are just like other drugs. Sure, there are many who disagree with the idea of solipsism, and they have good arguments, too. But even if one plays a little with the idea but generally rejects it he has to agree that in everyday life there can occur solipsistic everyday effects.