I disagree. I haven't heard anyone in the US say Soleimani was a good person. The liberal viewpoint is that killing him was an act of war, and there's no interest in war with Iran. Other complaints include a general belief that the killing made us less safe. Nobody knew what the short-term impact would be, and the long term impact is unknown. Also, increased tensions with Iran before the killing were directly caused by Trump's foreign policy, and the lack of communication and process involved in the killing meant we lost international support for future actions against Iran.