Good point.Yes, you bought premixed fuel with the assumption that it was good fuel. People buy that, fill up their weedeater, then refill it with gasoline and return it to the store for a refund. Sad, but true. The next guy buys it and runs it and ruins his saw. The cans for the most part are not tamper evident. Manufacturers are starting to implement tamper evident caps because of this issue.
Hadn't occurred to me people would be that diabolical, but I could see it happening.
So it is technically my fault in a way, which is fine.
I already blamed myself, but I now need to fix it, and rebuilding these little saws is not hard, but it is not fun either.