I'm sure it had nothing to do with that massive slave army of his. Him and his troops were just in Greece for a picnic. Right?
As for FOMENTing trouble in his "kingdom", the Ionian colonists weren't hurting anyone before the Persians decided they wanted to expand their Empire to include them. Setting up a puppet Dictator didn't go over so well, so the Ionian Greeks revolted, burnt a city, and took off for Marathon.
The Persians, Po'ed that some snotty Greeks would dare question their Empire building went after them... And repeated got their butts handed to them by Greek troops.
You don't need to revise history or edit out the parts you don't like. It'll stand on it's own...