I really hope if there is a Season 3, Dr. Smith does not return. Ugh. There really is no way that she could have survived.
Scarecrow was not the SARS robot. But the ones attacking were not the same as Scarecrow. It seems to me that there are different robots, so some bad, some good. The ones attacking were silver, Scarecrow was gold, Robot was black. So yeah, maybe they are allies, or on the same side in a robot war.