He said India has a healthy democracy but it does not mean that someone can hold the nation to ransom with guns in hands.
Addressing a conference of National Human Rights Commission here, Singh said Memon was executed after completion of all due judicial process.
"He was convicted by the highest court of the country - the Supreme Court. But in that case also some people tried to raise the issue of human rights. For a person like me, I failed to understand why such things are raised," he said in presence of representatives of state human rights commissions.
Referring to the issue of some organisations raising the issue of human rights of terrorists, Singh said he gets worried by such trends.
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"I get worried when some people raise the issue of human rights of terrorists and extremists when security forces resort to self defence action. These people consider more important the acts of terrorists and extremists and their human rights than that of security forces.
The Home Minister asked legal luminaries and human rights experts to give suggestions on how to deal with this tendency.
"If someone can give any suggestion, they may be legal luminaries or human rights experts, we can act only after your recommendations. It is your responsibility," he said
The Home Minister also expressed concern over some prisoners languishing in jails more time than the actual term they are supposed to be in jail.