Is there a contradiction between the Prophet's command to kill the Khawarij and his saying: "For in killing them there is much good, and they are the dogs of the people of Hell," and Imam Ali's statement about them: "They are further from disbelief"?

The preponderant view, held by the majority of scholars, is that the Khawarij are not disbelievers, despite their innovation and misguidance. The Prophet, peace and blessings be upon him, ordered their killing because they were rebellious aggressors and corrupters of religion, not for reasons of disbelief. Muslim scholars have unanimously agreed that the Khawarij are a sect of Muslims. They permitted marrying them, eating their slaughtered animals, and accepting their testimony. Most jurists consider them rebels and do not deem them disbelievers, while a group of Hadith scholars held the view of their disbelief. Ali, may Allah be pleased with him, was asked about them: "Are they disbelievers?" He said: "They have fled from disbelief." It was asked: "Are they hypocrites?" He said: "Indeed, hypocrites do not remember Allah except a little." It was asked: "Then what are they?" He said: "They are a people afflicted by a trial, so they became blind and deaf, and they rebelled against us and fought, so we fought them."