It is pretty silly to say we should definitely pick a defensive player with our first round pick. If the next A.J. Green or Julio Jones, or FredBeard is sitting there when you draft in the first round, and he is the best player on the board, you pull the trigger, and improve your team, and the cap. Then, with the embarassment of riches that you have at wide receiver you either dominate the league on offense, or trade Dez and his contract for defensive help.
It would be great if the next Demarcus Ware is sitting there when you go on the clock in the first, but needs do not and should not determine the pick unless the players are evenly rated and need can be the tie breaker.
You could go offense in round one, and easily follow up your picks with a second round de, and a linebacker in the 3rd and have seriously improved this defense. You might even get your safety of the future in the 4th round. Two above average players will change the look of this defense dramatically, if Lawrence stays eligible, which I think he will do.