I remember having read, not long ago -- although in some newspaper or magazine, not some technical journal -- that they were actually researching this whole panspermia thing, in the context of some asteroid or meteor that had entered the solar system, or something like that. (I'm sorry, my recollection is hazy. Nor will I take the trouble to Google this, because this is not central to the discussion at all, for reasons I will explain shortly).
Anyway, my point was: If people are still researching this, then obviously it means they've kept an open mind about it. If they'd been certain that such a thing is impossible, then why waste time and energy (and money) researching it out, right? Any scientific research necessarily requires an open mind. Surely that is obvious?
In any case, you seem not to have understood my underlying argument. Seen against the actual argument I was presenting to JoeMorgue, I'm afraid your objection -- even if for the sake of argument I were to grant that you are correct -- is pedantic.
JoeMorgue was objecting to hairsplitting about the God question, and protesting that nowehere else do we do this. And I was telling him that we do this all the time when precision is important, e.g. in court cases, and in detective fiction (and, I suppose, with actual detection by actual detectives as well), and with scientists who're actually testing out some particular issue.
This panspermia business was only an example. It can be easily substituted, if need be, with another that is more 'correct'.