Plus, if you actually read the entire article, you will see that this guy was very violent. Every time he was released from jail for a violent act, he went out and committed another violent act. He obviously did not learn from his mistakes. This shows that he was unable or unwilling to change.
And not worthy of commutation or clemency.
More from the article:
There were also three separate courtorom incidents in 1990 where Clemmons tried to use a weapon against a judge, threw a padlock at a bailiff, and tried to take a guard's pistol. A judge ordered Clemmons be placed in leg shackles because he felt Clemmons has threatened him. Clemmons also displayed very erratic behavior during the trial, mumbling loudly throughout the proceedings. He also made an obscene gesture toward one of the witnesses testifying against him.
The commutation by Huckabee of the sentence happened in 2000