According to the article, the students had been building an elaborate "Legotown," but it was accidentally demolished. The teachers decided its destruction was an opportunity to explore "the inequities of private ownership." According to the teachers, "Our intention was to promote a contrasting set of values: collectivity, collaboration, resource-sharing, and full democratic participation."
The children were allegedly incorporating into Legotown "their assumptions about ownership and the social power it conveys." These assumptions "mirrored those of a class-based, capitalist society -- a society that we teachers believe to be unjust and oppressive."
They claimed as their role shaping the children's "social and political understandings of ownership and economic equity ... from a perspective of social justice."
So they first explored with the children the issue of ownership. Not all of the students shared the teachers' anathema to private property ownership. "If I buy it, I own it," one child is quoted saying. The teachers then explored with the students concepts of fairness, equity, power, and other issues over a period of several months.
At the end of that time, Legos returned to the classroom after the children agreed to several guiding principles framed by the teachers, including that "All structures are public structures" and "All structures will be standard sizes." The teachers quote the children:
"A house is good because it is a community house."
"We should have equal houses. They should be standard sizes."
"It's important to have the same amount of power as other people over your building."
read the above. this has NOTHING to do with 'political correctness' or even with Legos, this has to do with school children being taught that democracy and capitalism is wrong and that a socialist society should be what they strive for.