The gangster is the key accused in the case of 1993 Mumbai serial blasts that left nearly 257 people dead, 713 seriously injured and destroyed properties worth Rs 27 crore.
"I am not saying we should forget his crimes but forget that Dawood would ever return to India. Pakistan will not permit it in any case. They will kill him, even if he attempts to do so. Dawood is in the captive custody of ISI," former Mumbai police commissioner M N Singh said.
The earlier "fear factor" of Dawood over Mumbai city and the metropolitan region has gone down, Singh said.
"We must understand that these gangs get a lot of support from local politicians and even police," he said.
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"I sadly admit that when I was investigating the Mumbai blasts case, I had found two police officials guilty of having nexus with such gangs. I dismissed them and it was an unfortunate thing," the former top cop said.
In the 1993 serial blasts case probe, Singh had headed the special investigation team (SIT) as joint commissioner of Mumbai (crime branch).
Kaskar was last month arrested in connection with an offence of extortion following a complaint by builder against him.