The London Mayor came under scrutiny following the incident in Westminster last Wednesday in which five people, including the terrorist, were killed in the attack.
Mr Khan was criticised by Donald Trump Jnr for saying that terror attacks were “part and parcel of living in a big city” last September.
Speaking on ABC’s Q&A, an audience member asked: “In wake of the London terror attacks in Westminster, the Mayor of London Mr Sadiq Khan stated that terror attacks are now part and parcel living in a big city.
“Sydney is a booming metropolitan capital with a population of five million Australians with diverse backgrounds and cultures.
An Australian audience member questioned whether terrorism was part of living in a big city
“Is Mr Khan right? And do residents and this win other major Australian cities need to accept terrorism as an inevitable part of modern life?”
Lydia Khalil, who has extensive national security experience, rejected the idea that people needed to accept terrorism was part of living in a big city.
She said: “I don’t agree with that premise that we just need to accept terrorism, just like we don’t need to accept any form of violence, whether it’s domestic violence or any type of assault or human trafficking.
“I’m not being naive, I know that there is violence and risk in everything out there, just to say we should accept it and carry on, I don’t think that is the right approach to it.
“That being said, I think our response to it is really the key thing. We can have more of an impact than the actual terrorist attack itself.
“If we have a measured response and we keep that social cohesion, then we will go a lot way I think to stopping terrorism.”
London mourns terror attack at vigil Fri, March 24, 2017
The world grieves after an attacker killed three people and injured about 40 near parliament in London.
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Floral tributes are left after the vigil in Trafalgar Square, London to remember those who lost their lives in the Westminster terrorist attack
Kerry Chikarovski a former MP reiterated that the country could not be complacent in regards to terrorism.
She said: “I think we have to acknowledge that terrorism is around us but I don’t think we should be complacent about it.
“I don’t think we should in any way detract from the fact that we have incredibly good security services in his country, that have been pretty good at making sure that we haven’t been subject to the sort of attack.
“We joke about ‘be alert, don’t be afraid’, well I think that is actually quite a good slogan to live by in a big city these days.
“I guess be conscious of what is around you but if we are all going to lock ourselves in our apartments and our houses then we may as well give up to the terrorists and I don’t think that’s our culture.”