Funerals and commemorations make that support visible.
Reza Nasri, a lawyer close to the government, said the images showed the US never understood Iran.
He called it one of the largest human gatherings on earth, expressing grief, pride, and cohesion.
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Hossein Rouyvaran, political science professor at Tehran University, argued that Western theories are materialistic, but what happened in Tehran transcends materialism.
He said the war changed the social contract, uniting former opponents under the Iranian flag.
Some aspects of Khamenei's canonization bordered on absurd. Justice Minister Amin Hossein Rahimi said the judiciary enabled lawsuits over mental harm from the leader's loss.
Rouyvaran said the marches will legitimize the government and give it a freer hand in negotiations with the US.
However, fractures exist, and advocates of confrontation may gain the upper hand.
Activity around the Strait of Hormuz, including gunfire at Qatari LNG tankers, suggests Iran is not relaxing its grip.
Foreign Minister Abbas Araghchi, seen riding helmetless to the funeral, faces demands for revenge.
Responding to Trump's threats, Araghchi said millions of proud Iranians rallied, and negotiations will not commence if threats continue.
Abdollah Ramezanzadeh, retired professor at the University of Tehran, expressed concern over state TV's push for revenge and rejection of negotiation.
He warned against extremists dragging the country into war.
Hesamoddin Ashna, adviser to former president Hassan Rouhani, urged employing justice and rationality to witness Iran's resurgence.
Some noted that former presidents Khatami, Ahmadinejad, and Rouhani were excluded from ceremonies, questioning the claim of national cohesion.
Also absent was Ali Asghar Hijazi, deputy chief of Khamenei's office, who opposed elevating Khamenei's son Mojtaba as successor.
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The battle for Iran's soul, both subterranean and in the streets, is entering a new phase.
