Bravehearts founder Hetty Johnston's call for action after sex abuse claims made against former childcare worker

Bravehearts founder and child protection advocate Hetty Johnston has spoken out after hearing the sex abuse claims made against a former childcare worker.

Australian Federal Police have arrested the 45-year-old man for the alleged "unfathomable" sexual abuse of almost 100 children at various childcare centres in Brisbane and Sydney over a 15-year period.

The Gold Coast man's alleged offending included 136 counts of rape and 110 counts of sexual intercourse with a child under 10.

Speaking with Deb Knight on her afternoon 2GB show, Johnston expressed her disgust and urged the government to take action, revealing that a ban on windowless walls and doors could be a vital first step.

"We just had a royal commission that went for years and costs tens of millions or dollars," said the safeguarding governance consultant. "All the answers are in those pages, we just have to adopt the national child safe principles, something Queensland have been really slow to do."

Listen to interview above.

READ MORE: The parenting milestone Jackie O is steeling herself for

Johnston also claimed there was a lack of public understanding surrounding how these predators think, which leaves citizens in a really vulnerable position.

"We all need to understand how predators work, how they think and what to look for, and how to respond," she said. "So long as we don't know that, we're blind."

Speaking to the 'heartbreaking' claims being brought before a court, the advocate confessed she wouldn't be surprised if those working with the alleged abuser thought "he's be the last person we thought would do something like this".

"That's what they do, they set themselves up into a position where they gain trust from everyone around them," she said.

READ MORE: Harry and Meghan urged to 'regroup' during Hollywood strikes

Johnson said childcare buildings that have windowless walls are allowing this kind of abuse to go on unchecked.

"There shouldn't be any solid walls in a childcare centre, it should be all windows," she continued. "Nobody should be allowed to be alone in a childcare centre or in a school for that matter."

"It's 100 per cent avoidable if we could just get governments to act on this as a matter of priority," she added.

Later in the segment, Knight and Johnston spoke about the difficulty for the survivors and their families.

"My heart goes out to the parents of these children as well, as a parent of a child who's been sexually assaulted I know the pain of that, Johnston shared. "It's a very helpless feeling and you don't quite know what to do to fix it."

She added: "You can't undo what's been done you can only pour love all over it."

READ MORE: Royal starts university in Sydney

While discussing the guilt that many parents feel as a result of their child being harmed without their knowledge, Johnston emphasised the responsibility on childcare organisations.

"You have every right in a childcare centre to expect that the people working there are safe, they've been vetted, they've been monitored," she said. "But we see they're not."

"It's heartbreaking, and even more heartbreaking because it's avoidable."

A last note of advice to parents coming from Johnston was to ask day cares whether they are following the national child safe principles and whether they've been audited to prove they're doing so to standard.

"Once they're doing that, the chances are so so slim for that to happen again," she said.

"These offenders will find the weakest link, the weakest organisation and take advantage of the situation."

If you, or anyone you know is struggling, please contact: Lifeline 13 11 14; beyondblue 1300 224 636; Domestic Violence Line 1800 65 64 63; 1800-RESPECT 1800 737 732