It wasn't a bad question. And it wasn't as if Tony wasn't a bit distrusting himself - he was, and he knew better than to think everyone was good. But in this instance, he'd considered that very question already, more than once.
"I get you," he reassured, because there was no point in sugar coating just to be kind. Tony wasn't really that sort of person. "And yeah- there are a few, myself included. I've got nothing to gain from it, my whole family was down and out." John wasn't putting blame on him but he felt like all the bases ought to be covered. "Otherwise there are -- there's the Doctor. She wouldn't, though. You'll see. It's simply not a possibility. And I think one or two of the Peter's could do it. Except they were really sick too, so that seems counterproductive." He shrugged, fingers tapping against the top of his desk. "I don't think it was anyone here. I think the most likely explanation was something to do with the Doors. You seen them, yet?"