Of course Costa is a dirty player. All of that sound like excuses. Suarez has a mental problem and needs help, then Pepe does too. The way they express their crazyness may differ, but it's the same principle to me. Both are crazy dirty players. You can't excuse one, saying he is an animal because of his tackles or that he has no remorse, and then say the other that bites(an animalistic thing) is "less worse" because he "just bites". And the worst thing he did was to racially abuse evra, but that somehow gets under the radar.
If what Suarez does is excusable, than what Pepe does is too.
They may sound like excuses but the aren't it is just my opinion. Bascially all those players may look similar on the pitch in terms of their agressiveness. But at a closer look there are total different behaviors in both frequency and severity from their actions.
The main difference between Pepe and Suarez imo is not about remorse. Frist can and most likely would have wanted numerous times to end other players careers or at least injure them as hard as he could in many different ways and many times.
Suarez on the other hand suffers from a specific mental disorder that made him bite three times during his entire professional career. Biting cannot make a player seriously injured and incapacitate him for a long while or for good as some really hard tackles can do this.
The abuse he did on Evra is serious but is also as far as I know a singular case.
I think rm worked on Pepe's disorder because it's been a good while now since I last saw him being El Animal. I firmly believe Barca must work on Suarez issue too so that he won't do this ever again or at least minimze the risk as much as possbile. I'm sure nobody of us would want to see him bite Pepe in an El Clasico or whatever crucial match for Barca that not only could shit on the club's image but probably result in a very lenghty ban for Suarez too.