Getting back to the OP again...he was asking why a penalty was called, instead of just ruling the pass incomplete. The answer, is that the pass was not incomplete. Benn caught the ball in the air, got two feet inbounds, and ran down the field. His foot touched the sideline before the catch, but by the time the ball touched his hands, his feet were no longer on the sideline. Notice that the officials did not blow the whistle, which they would do if the pass was actually incomplete, e.g. if Benn had one foot on the sideline when catching the ball. Since the pass was legally complete, but yet the receiver did something else illegal (stepped OOB and did not re-establish himself on the field of play BEFORE catching the ball), then the only way to invalidate the play is to call a penalty for the other infraction.
Good Post, but the bolded part is not relevant to the play. Even if the reciever does re-establish himself in the field of play, it is a penalty if he is the first player to touch the ball. If the ball had been tipped, a reciever who has re-established himself is eligible.
You're right, of course; I confused that detail in my head after reading this thread, lol.The point remains that a penalty has to be called on this play, because the catch portion was ruled complete. Renesauz keeps missing that this play was ruled a completed pass, but with an infraction against the receiver. The pass was not ruled as incomplete. The following is from the play-by-play log of the game:
2-7-TB 38

11) 5-J.Freeman pass deep right to 17-A.Benn for 62 yards, TOUCHDOWN NULLIFIED by Penalty. PENALTY on TB-17-A.Benn, Illegal Touch Pass, 5 yards, enforced at TB 38 - No Play. Tampa Bay challenged the runner was in bounds ruling, and the play was Upheld. (Timeout #1.)
The penalty is essential in this case, in order to cancel the effects of the play. If his foot was OOB while catching the pass, there is no penalty, because it is unnecessary; the pass is ruled incomplete. Essentially, I agree with the intention and spirit of Renesauz's posts, but this is not a valid example to explain his point.