As the age old adage says , “ Dead men tell no tales” , Although it is common knowledge that Beant and Satwant Singh surrendered after shooting Mrs. Gandhi saying “ we have done what we had to , now you can do with us what you want to.” they were quickly unarmed and shot by their on-duty fellow colleagues to hide their own incompetence and to take the pressure off of them as they will be intensely grilled by investigating agency for their failure to protect the ruling prime minister of the country.
So in order to prove that they were quick to take action against the culprits they thought it better to shoot them on the spot. This act will also save them from the wrath of the “family” for not doing enough on their part. There was also much Ill will against Sikhs as media of the time painted them traitors who are bent upon to break India with outside help. Congress's political meddling in Punjab's affairs and subsequent rise and death of Bhindrawale , operation blue star and militancy in state had already polarized the communities with much real and imagined bad blood between them.
They may have been shot to hide some bigger conspiracy behind the assassination , although chances are remote as Satwant Singh survived the shooting only to be hanged later after found guilty by court , and in all these years none other conspiracy theory surfaced , She was assassinated simply for her role in operation blue star #india #media #yusufbhandarkar