The preacher, who once led a week-long armed conflict against Pakistan's army and has repeatedly called for the overthrow of the government, has now been muzzled by authorities - though technically he remains a free man and a revered figure among the Taliban.
It is this duality - where hardened resolve against groups such as the Taliban is blunted by a willingness to tolerate and even fan the flames of extremism still bubbling beneath society's surface - that activists say sums up the country's more than decade-long battle against a homegrown Islamist insurgency.
It was at the dun-coloured mosque at the centre of Pakistan's leafy capital that Muhammad Jibran Nasir, a 28- year-old lawyer, organised a demonstration in the wake of Aziz's refusal to condemn the attack.
That protest, which called for the cleric's arrest for inciting hate speech, snowballed into a nationwide movement among marginalised urban liberals who rallied to "Reclaim Pakistan" from the clutches of Islamist violence.
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"The country was devoid of any road map for fighting these extremist forces, but now I think they have found their way," said security analyst Imtiaz Gul.
According to Nasir, however, a military operation against extremists and government crackdown in the wake of the massacre have simply diverted attention from what lies beneath.
Activists have noted some improvement, particularly after the Supreme Court observed in October that calling for reform to controversial blasphemy legislation is not equivalent to committing blasphemy. But violence against those accused of blasphemy continues unabated, with hardliners inciting attacks that often target minorities.