This incident is indeed of great concern and sounds the youth alienation alarm bell loud and clear to those without Coalition ear muffs.
The timing so soon after Hockey's disgusting budget clearly demonstrates the root cause - that being the demonization and denigration of young people and the massive un-heralded discrimination against, $cuts to and $wealth transfer made by Tony Abbott's class targeting budget.
As if adding insult to irritation I'm therefore not sure why that Nine News report missed this aspect of the incident:
"... Student Union board vice-president Tom Raue was among the protesters and said shortly after their actions were captured on video that he was pushed down a stone stairway by a plain-clothes security guard. "The police and security guards were very violent," he said. "It was quite rough." Mr Raue described the security response to the students' demonstration against budget cuts as an "over-reaction". ..."
