After vision of Black Lives Matter demonstrators toppling a statue of Edward Colston into Bristol Harbour made worldwide headlines, Greens Senator Jordon Steele-John cheered them on social media.

"It's great to see these symbols of white supremacy being torn down - It's made me think a lot about how many similar statues and symbols we have here in WA," he posted.

In another tweet, he asked "What would be the first symbol or statue you'd get rid of? I'd start with Stirling Highway", referring to WA's first governor James Stirling, who led an attack on Aboriginal people in 1834 known as the Pinjarra Massacre.

WA Liberal upper house MP Tjorn Sibma said the senator was deliberately importing stupidity and violence into the community, labelling his remarks "an incitement to criminal behaviour, anarchy and vandalism".

"Freedom of speech, particularly that provided by public figures, demands an equal measure of public responsibility," Mr Sibma told parliament.

"His contribution is an absolute disgrace.

"It must be condemned by his party colleagues and by anybody who holds dear their responsibilities to this community."

A spokesman for Senator Steele-John referred questions to Greens spokeswoman on First Nations peoples' issues, Rachel Siewert, who said Australians needed to tell the truth about the way the nation was colonised and "unfinished business" remained.

"Many of the statues we see around Australia are of people that would have caused a lot of distress for some First Nations peoples given their involvement in the dispossession, oppression and destruction of their culture," Senator Siewert said in a statement.

"We should also be asking why we place such significance on these figures rather than celebrating and acknowledging First Nations living cultures and traditions."

Australian Associated Press