Whatever players did before they were drafted does not matter if the NFL vetted them and allowed them to enter the draft and be drafted by a team.
If they do something now that they are on the team then that is fair game to be discussed.
The bottom line is they were drafted by the Cowboys.
Whether you liked the pick or not, they are on the team and no amount of complaining or self-righteousness will change that fact, so it is time to move on.
If you want to complain about their ability or performance in college, go for it.
If you want to discuss, complain or defend their questionable past, I suggest you find another site!