The septuagenarian actor-politician said he has the highest regard for Prime Minister Narendra Modi.
"Who is saying this, those who are responsible for the humiliating defeat in Bihar. Those who themselves are on their way out, those who are not able to show their faces. They are only giving vent to their frustration," he said.
Such leaders should look their own credentials first, he told reporters here.
The MP from Patna Sahib was replying to a query on the remarks of some BJP leaders in Bihar that Sinha should quit his Lok Sabha membership over his critical comments.
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"I have never ever gone against my party, against the Constitution. I never ever gone against my nation. I love my motherland. I am a very proud Indian. I have full faith in the Constitution. I have highest regard for our Prime Minister Narendra Modi. But, certain things which have happened, I wish, hope and pray that good sense will prevail upon our people and peace would return.
When told he appeared to have earlier supported JNUSU President Kanhaiya Kumar, arrested on sedition charge, Sinha said he had spoken on the issue when it was not sub-judice and on the basis of material available to him then.
"...We have the highest regard for judiciary. Let the judiciary decide (the case involving Kumar)," he said.
Sinha was speaking on the sidelines of an event where his biography "Anything but Khamosh" was launched.
Communications, who represents Gorakhpur in the Lok Sabha, was initially admitted to Apollo Hospital and later shifted to the Railway Hospital.
According to sources, the accident took place when the vehicle ahead of the minister's car in the cavalcade suddenly applied brakes to avoid hitting a man. The car carrying Sinha hit the vehicle from behind and in the impact, the minister sustained injury.
The CPRO said the minister would be flown to Delhi tomorrow morning.
Railway Minister Suresh Prabhu tweeted: "Shocked to learn about accident to my colleague and friend @manojsinhabjp Wishing him speedy recovery."