That's not enough for me to trust him. Motive's and 'lying' can be separate. A guy can tell the truth with twisted motives in mind. Also, I mean, look at him, he's just begging for people to be suspicious of him.
Hm, he really is being crazy-obvious about it. I mean the not showing his face, the ominous voice overs, the prophecies of destruction, the fact that he won't give anyone a straight answer... he might as well just start wearing a dark, hooded cloak and cackling into a crystal ball. I guess that kind of points to him being a manifestation of tropes: he's using almost every supsicious villain trope in the book.
So... maybe that's DELIBERATE on his part? Maybe he doesn't WANT us to go around trusting people, himself included, because trust in one person or another can cloud one's judgement of the overall facts? He wants us to, essentially, work all this out on our own, and come to our solutions and conclusions based on our own judgement.
I dunno, I still don't know if he has good motives in mind, and you can tell a lot about a guy by how he treats his inferiors, so...