There has been more than one occasion where the perception of what we're doing comes across poorly, even if we're doing things right -- mostly because we're not enforcing rules like the coaches/fans/players see on TV. Usually, we can explain to a coach the rule behind the call, but the one that's gotten the most pushback is when we seemingly mark off 12 yards on a 10 yard penalty.
Yes, the spot of the foul was 2 yards behind the LOS, but it just looks like we can't count to 10. We're doing it right, but it looks like we're doing it wrong - especially to every fan who can now clearly see that it's 1st and 22 after a 10 yard penalty.
I understand the arguments for and against it, but there's a couple things in this thread that really highlight the disparity of this. First, especially holding on the line can have a huge "window" for the spot of the foul. Ball snapped at the A20, first contact is made at the A19, the defender is grabbed at the A18, started to be pulled off balance at the A16 and hits the ground between the A15 and A13 (he's 6' tall, after all). Where's the "spot of the foul"? At our discretion, we can essentially add five yards to the penalty. Secondly, Al's point about it incentivizing fouling -- if you have a QB scrambling and a lineman realizes he can "help" by tackling the oncoming defender, he's not doing mental math to figure out how many yards the penalty will be. He's just hoping it won't get called at all.