Technically, he was emphasizing how low the probability was, not the risk. Since the impact is pretty high in both cases (accepting a malicious object/mid-air collision), the risk (as a combination of probability & impact) is significant.
I think you're getting downvoted because while you may not necessarily be wrong, you're also not really disagreeing with what I said, just making a distinction that isn't all that important (in the context of this conversation).
