A thumbs down on targeting Tesla owners. Not worth your time or personal risk, and it will likely do more harm for the cause than good. Public sentiment is important.
Sure, they can choose to sell them...but someone has to buy it. Then is the buyer now a target? The number of targets doesn't decrease until the car goes to the scrapyard.
EDIT: Another point, don't ever take unsolicited intel at face value. Verify. This could easily be a bad actor trying to stoke random violence.