Trust? I trust a company to want to deliver value so their product continues.
And when they fail to, the product fails (like Vista).
Yes, I don't trust the big AV companies because they survive by consumer fear.
Do I think they're perpetrating viruses? Well, let's just say I wouldn't be surprised if they were. I would rather think they're not, but if there was a slow down in attacks where would they be financially?
All the 'trial' versions are, are ways to ease you into paying for something you wish you didn't have to pay for, no?