No that's entirely very wrong. They at first did not want to fight the Thargoids and didn't pick up weapons. They made numberous communication attempts to the point that they knew and understood the Thargoid language. Yet the Thargoids did not want to/respond to any attempts at communication. The Thargoids chose to continue their hostilities instead of communicating. Therefor the Guardians had to pick up the weapons and defend themselfs. The Guardian AI had nothing to do with the Thargoids, but did it's actions because of Guardian Civil wars.
After reading the Lore again it's true what you say but again there is a purpose of the attack Guardians again entered territory not theirs. Based on that Thargoids saw Guardians as a threat. Thargoids are older then any race known in the galaxy. What is theirs is theirs they are a territorial species. They view their resources and technology as their upmost needed protection.
If you can't see that as a reason to attack then obviously your still missing the picture again. If the guardians didn't settle on those planets they would of been safe. Communication or not you to enter a terrority that is not your own. The Guardians knew what they were doing and neglected to take precautionary measure to prevent that. Either way the Guardians were a threat no matter the circumstances that lead to it. They invaded a land not theirs and they knew it. And the Guardian AI saw them as a threat and wipe them out.
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