Either they deviated by a large margin or the area they were cleared for was too small because you don't just get mildly blown off course enough to exit a decent clearance area.
Maybe. There are lots of explanations for not having a larger test area, or for miscalculating a manually piloted crafts mach 3+ trajectory.
But you're missing the bigger
point.
It may have been completely unrelated to weather. By "something similar" I mean an innocent, isolated, non-cultural and non-conspiratorial explanation, that won't involve the FAA digging (or having to dig) any deeper than the superficial proximate cause.
It was a test flight of a manually piloted craft. To some extent, things will not go as expected.
Boeing and Russias last manned flights weren't manually controlled, and both had significant problems- early rocket shutdown and an unintentional, initially unstoppable thruster firing.
Yeah it needs investigating, but it's hardly unexpected or uncommon, especially for a test flight.