The key point is that whether or not meteorite mediated transfer is possible it is far more likely than unmediated transfer. You deny the most likely form but embrace the least likely one. The logical inconsistancey in what you present as evidence for your cause (Martian rocks are not contaminating Earth but diseases are coming from space) continues to elude you.

There is scientific disagreement over whether meteorite based transfer is possible, however, I see no reason to support Clark's position as pre-iminent. What makes you think he is more qualified than the rest other than that you like his take on the issue? There have certainly been many other papers from several authors supporting the meteorite based transfer model.

Does you pal Chandra W. also do the panspermia two step or does he support all proposed modes of transport? Do we have yet another case of the BD selective quotation of experts here? Do you quote Chandra when he agrees with you but someone else when he doesn't?

Regards,
Mark Eby