There are always receivers open enough to be thrown to in the NFL. Every play.
Look at Rosen's pass that I posted in this thread. That receiver wasn't remotely open. Rosen threw him open with a perfect pass. Allen needs to throw those. If that results in more picks because Allen isn't throwing an accurate ball, then we can blame his accuracy instead of his tentativeness. If that results in more picks because his receivers have no ball skills, then we can blame his receivers.