Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

The Quran narrates many blasphemous statements of the disbelievers about Allah, the Quran, and the Prophet (peace be upon him), and yet there was no action taken against them.

The Prophet, peace be upon him, only waged war on those who waged war against him. They were the ones who expelled him and the small group of believers from their lands and possessions and made several attempts to assassinate him and persecuted him and his followers. They reduced the Prophet and his clan to a valley for months where they were forced to starvation and ate grass and plants to survive!

As for the work you mentioned, namely, Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs, the Hadith critics have judged it as a pure forgery, and therefore we cannot rely on it.

Safwan b. Umayyah was one of the chiefs of Quraysh who waged wars against the Prophet (peace be upon him) for years. He was also the one who plotted and sent Umayr b. Wahab with a poisoned sword to Madinah to assassinate the Prophet, peace be upon him.

It was only a miracle of Allah that saved the Prophet. The fact that even after all of such acts of terrorism, the Prophet (peace be upon), spared his life is clear evidence that the Prophet, peace be upon him, was a peacemaker and mercy for the worlds. Thanks to his mercy the even his deadliest enemies like Safwan, Ikrimah, Umayr and hundreds of others became Muslims and staunch defenders of Islam and the Prophet, peace be upon him.

Almighty Allah knows best.