Back in the day, it would take ages to download and install software, and it could mess up your system. If now was then, I'd see your point.

But if you don't trust a software, then you should never install it, and you should never ask for reinsurance from the software makers. If their goal is to compromise personal computers, then they will also lie in any information they put out.

It's like being at a car dealer that you think is a criminal, and asking him to double-pinky swear that the car you're looking at wasn't stolen.