Cr Greg Mohr took to social media early yesterday in the wake of the siege at the Lindt Cafe that left the gunman and two hostages dead.

"It's about time these soft-c-ked left wing politicians hardened up and grew a brain and stopped being so soft," Cr Mohr posted on Facebook.

"This NON-Australian was on bail for committing a serious crime, when he should of (sic) been deported in the first instance".

Cr Mohr described the outcome of the fatal siege as "gut wrenching".

"To have something like this happen in our backyard is disgraceful," he said.

Man Haron Monis, a self-styled sheikh shot dead by police in the early hours of Tuesday morning, was before the courts on two separate and serious matters: more than 40 sexual assault charges involving seven alleged victims; and as an accessory to the murder of his former wife.

He died seven years after first coming to the attention of police, when he penned poisonous letters to the family of Australian soldiers killed in the Middle East.

Monis, 50, was given bail at Penrith Local Court on December 12 last year after being charged with being an accessory before and after the fact to the murder of his ex-wife and mother of their two children, Noleen Hayson Pal, 30.

Ms Pal was allegedly stabbed 18 times and set alight in an apartment stairwell in Werrington on April 21, 2013.

Cr Mohr felt he spoke for many when he said the Bail Act was "too soft" and the gunman should have been behind bars instead of out on the streets.

"He was granted refugee status and should not have been given a second chance after the first time," he said.

"How many chances does he need? He had 40 sexual assault charges against his name for a start. That didn't all happen overnight."

Cr Mohr said perceived leniency sent the wrong message to those thinking of committing similar acts.

"Just like any repeat offender, if they think they can get away with it they will keep doing it," he said.

While it had not been established the gunman was acting on behalf of any particular terrorist group, Cr Mohr said in the prevailing climate authorities should make keeping track of suspected terrorists a priority.

"We have monitoring and registers for paedophiles where they have to clock in on certain dates, why not for extremist groups?" he said.

"Our country has been on alert since 9/11, and more recently there was intelligence that there was going to be a beheading in central Sydney," he said.

"The laws should have been tightened then. We need to stop waiting for stuff to happen before we act."

And when it came to the notion of the Australian government bailing out anyone who had found themselves in danger overseas after leaving to join terrorist organisations, that, too, got a big "no" from Cr Mohr.

"These groups like ISIS, I think, are a bigger threat than Al-Qaeda in the way that they are brainwashing young people," he said.

"The Australian government must not help people who've chosen to do that - once they go there, the border should be shut."

Australia had a "giving" nature, Cr Mohr said, but he was concerned the nation's generosity might be taken advantage of by those who sought to harm it.

"Left wing politicians, do-gooders and civil libertarians sit back and say it'll be right, but we need measures to combat extremist idiots like this fool with a history that's grown long since he was granted refugee status," he said.

"Once people start threatening what someone like this has, supposedly using religion as an excuse to commit crimes, Australia needs to stand up and say 'enough is enough'.

"I'd like to say we won't see any more but who can say that? I hope I'm wrong when I fear something even bigger is down the track."