Two articles, one by the LeT expert, Stephen Tankel via WoTR and the otehr by ProPublica retuirns - as Stephen - does to the lack of any penalty for Pakistani's role in the attack.

Stephen's last passage:
India executed Kasab in late November 2012, almost four years to the day after the Mumbai attacks began. U.S. authorities arrested David Headley, the Pakistani-American who conducted reconnaissance for the attacks, in the United States, where he is currently in prison. But their leaders in Lashkar-e-Taiba and the ISI handlers supporting them got away pretty much scot-free. The Pakistani authorities charged seven of the group’s members, including the group’s second-in-command, in connection with the attacks. Not surprisingly, none were convicted in Pakistani courts, or extradited to India. All are back on the street. The ISI handlers who supported the attack reportedly moved on to other assignments. Lashkar-e-Taiba leaders not only remain at large. They and the group their organization arguably have more influence in Pakistan than ever before.
Link:https://warontherocks.com/2018/11/te...ier-than-ever/

Link:https://www.propublica.org/article/t...-mumbai-attack