Singh said the PM should adhere to the advice he gave him, and speak more often.
Singh expressed his views in an interview with the Indian Express while speaking over the silence that Modi maintained following the rape cases in Kathua and Unnao that have enraged the entire country.
Security forces were reportedly forced to use tear gas and smoke gas shells to disperse the protesters when they resorted to stone pelting.
Narendra Modi broke his silence on the rape cases on Friday at an event in Delhi where he said that the guilty will not be spared and daughter of India will get justice. "I feel that the advice that he used to give me, he should follow it himself", he said.
Meanwhile, senior BJP leader and former Forest Minister Lal Singh took out a rally from Jammu to Kathua on Tuesday to demand a CBI probe into the case.
Manmohan Singh said PM Modi's silence on Kathua and Unnao incidents let people think that they could get away without stern action being taken against them. But he conceded that there may have been pressure from her party's coalition partner, the Bharatiya Janata Party, to slow down.
"The Congress also tried to politicise the issue in Jammu by staging protests and taking out candle march but it is not an issue, which is to be given a political or communal colour", Dr Singh told reporters here. These three issues were bound to snowball in this previous year before general elections in 2019, he said. "They should also strengthen laws against hate crime", Ashraf said noting that the response from the prime minister was little too late.
He advised the centre should direct states to enforce law and order properly, and that minorities, Dalits and women aren't ill-treated.