When JWs accept new light they must, by default, accept that what they WERE teaching was false. They allow themselves the luxury of error so long as it is in the pursuit of better understanding.
You would think this scenario demands that allowance be made for other religions with false teachings, but alas, no. A typical answer given by JWs at this point is:
"But we find the mistakes and fix them. Other religions don't."
I'm not familiar enough with other religions to confirm or deny that assertion. How would you respond to such a statement?