Based on what I have gathered about the man:
He was truly a Muslim Arab legend. The man spent 22 years in Israeli prisons.
He learned Hebrew, established a research center focused on Israeli political and social studies in PRISON, and closely followed US politics.
He once told his Israeli prison interrogator:
“When I get out of prison, you will be in my place, and I will be in yours.”
He chose an impeccable timing for his “flood” operation.
One freed Palestinian captive who shared a cell with Sinwar said in an interview that when he saw Sinwar, he could not believe it. He thought Sinwar was dead. All he knew about Sinwar was what he had read: that he founded the Majd intelligence in the 1980s, an organization tasked with tracking collaborators and eliminating them.
When he told Sinwar that he thought he had been “martyred,” Sinwar replied:
“May Allah grant me the honour of martyrdom.”
He said he had never met anyone with strategic thinking like Sinwar.
Sinwar said Israel would not fall all at once: “Just as the Zionist project was built in stages, it will fall in stages.”
Yup, I totally understand why the Americans and Israelis hate this guy even after his death and keep posting memes about him. He tipped the first domino of their demise!