Five CRPF personnel were also injured in Thursday's attack, one of the deadliest in Jammu and Kashmir, when a suicide bomber rammed a vehicle carrying over 100 kg of explosives into their bus in Pulwama district.
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Pakistan-based terror group Jaish-e-Mohammed (JeM) has claimed responsibility for the attack that took place about 20 km from Srinagar.
Sidhu, who was among the invitees for the swearing-in ceremony of Imran Khan as Pakistan prime minister last year, however posed, "For a handful of people, can you blame the entire nation and can you blame an individual?"
Talking to reporters here after the Punjab Assembly was adjourned for the day in solidarity with the CRPF soldiers killed in the terror attack, the cricketer-turned-politician said, "It (the attack) is a cowardly act and I condemn it firmly. Violence is always condemnable and those who did it must be punished."
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Asserting that terrorism has no caste or religion, Sidhu said, "For the last�71 years, this has been happening. Had they stopped ever?"
"For me, violence is always condemnable. I believe in non-violence throughout. Violence is no solution for anything. For me, non-violence is the most potent weapon to move forward," he added.
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More than 2,500 Central Reserve Police Force personnel, many of them returning from leave to rejoin duty in the Valley, were travelling in a convoy of 78 vehicles when they were ambushed on the Srinagar-Jammu national highway at Latoomode in Awantipora in south Kashmir around 3.15 pm on Thursday.