Illegal Forward Pass

[MLE]

I undersand that it is a rule...I am asking from a commeon sense point of view. Example: 4th and 1 yd for 1st down, QB rolls and runs past the 1st down marker then throws pass. Common sense says that the infraction happened when the player attempted a pass over the LOS, thus the LOS should be the determining factor. In the example, a first down would be awarded along with the 5 yd penalty.

Call me crazy, but some things don't make sense