Why did Krishna killed only shishupal

Why did Krishna killed only shishupal on abusive words of shishupal? Didn't shakuni, duryodhan or any other person said bad about Krishna earlier or afterwards during war? Lord Krishna didn't just punish Shishupala for his abusive words. Shishupala was also punished for his various crimes against the Yadavas. A. Krishna describes Shishupala’s crimes - This wretch of cruel deeds, you kings, hearing that we had gone to the city of Pragjyotisha, came and burnt Dwaraka, although he is the son of my father’s sister. While king Bhoja was sporting on the Raivataka hill, this one fell upon the attendants of that king and slew and led away many of them in chains to his own city. Sinful in all his purpose, this wretch, in order to obstruct the sacrifice of my father, stole the sacrificial horse of the horse-sacrifice that had been let loose under the guard of armed men. Prompted by sinful motives, this one ravished the reluctant wife of the innocent Vabhru (Akrura) on her way from Dwaraka to the country of the Sauviras. This injurer of his maternal uncle, disguising himself in the attire of the king of Karusha, ravished also the innocent Bhadra, the princess of Visala, the intended bride of king Karusha. Section XLIV, Shishupala Vadha Parva, Mahabharata. 1. While Krishna was away fighting Narakasura, Shishupala set fire to Dwaraka. 2. Ambushed King Bhoja and enslaved his attendents. 3. Stole the Ashwamedha horse of vasudeva. 4. Raped the young wife of Akroora. 5. Raped Bhadra, the bride of king Karusha.