Jews Fishing Net On Sabbath
The crime of the people of the sabbath was not only that they disobeyed, but ayahs 7:163-166 make it very clear that they disdainfully persisted in their disobedience. There were people amongst them who were trying to stop them making it absolutely clear that if they continued in that manner, God will destroy them. When they denied after understanding what was required of them, God separated believers from the non-believers as per his sunnah, and punished the non-believers.