[playdead]

> I still think Plato invented Socrates.

No, he was an actual historical person. Plato of course wrote a more literary depiction of him, not a direct transcript of his conversations.

> If Socrates was so wise, why did he get himself killed in such a dumb way?

You should probably actually read the dialogues (at least the Apology and the Crito) and you'll understand what happened. Socrates explicitly chose not to escape prison and to go through with the execution, and he gives his reasons in the Crito.