Banned? haha, that sounds funny, Pakistan banned LeT, JeM etc... You see Masood Azhar was caught from India for supporting terrorism in Jammu and Kashmir. His brother, Ibrahim Athar hijacked an Indian flight landed it in Kandahaar, demanded release of Masood Azhar from India, and some other terrorists. After their release both subsequently disappeared into Pakistan.
Masood Azhar didn't came to India to propagate peace, but to stop civil war between two terror groups. He maybe a law abiding ideal citizen to you. Not others. India do not have to show anything, your own terror organization claimed responsibility for it through multiple sources. And I'm not saying Pakistanis like you, or the vast majority our there are directly involved in this terror attack (or even support these groups), I'm only saying Pakistan state is responsible for their actions in supporting these outfits and hence the actions of these outfits is your responsibility.
Also, by support, I didn't mean open endorsement from establishment or military, which has become impossible since you made America unhappy in the 2002, and was Forced to ban these outfits after Indian parliament attack.