couldn't possibly dissuade a BUK operator from firing out of fear of hitting the wrong plane? Or that such an event wouldn't be beneficial for the same people who had the authority to declare the airspace safe for commercial airlines?
According to reports they were doing this long before separatists obtained the means to shoot any down. It's enough to actually hide, ie come in when the usual planes are expected, so people may mistake them, long enough not to take quick aim with a MANPAD.
I don't see Ukraine being ale to use MH17 to much advantage. They certainly would not be trying to get someone else to shoot it down.