"As far as morals, integrity and principles ... contemporary political leaders seem to be driven by money and self-interest," he says.
Radebe hangs out at the African-focused Xarra Books in Johannesburg's Newtown Cultural Precinct.
June Josephs-Langa, managing director of the African-focused Xarra, says South Africa's younger generation is more assertive and "proudly African."
The ones wearing Biko T-shirts may not all be like Radebe, but they are making a statement, she says.
"In the same way many don't know much about Cuban politics, the revolutionary status of Che Guevara is someone they want to identify with, want to parade," she said.
But Johannesburg-based academic and cultural commentator Achille Mbembe, who is delivering a lecture in Biko's honor this week, doesn't see fashion as a fitting tribute to a man whose "death and life dramatically embodies the idea of freedom."
"I think South Africa could commemorate Biko's contribution to black emancipation in more powerful ways," he says.
Nkosinathi Biko, who was six when his father died, takes a more reconciliatory tone.
He points to the tradition in the anti-apartheid movement of using T-shirts to spread political messages or pay tribute to fallen comrades.
He also acknowledges that the wealth of artistic material created in his father's name has been important in keeping the memory of Biko alive.
"He is one of the attractive symbols of popular culture. Not just here but on the streets of New York, Brasilia and Liverpool, he is someone who resonates well," he says.
However, as head of the Steve Biko Foundation, he is mindful of ensuring his father's name and image are not abused.
The foundation has been running a nationwide commemorative program this year that includes a young-writers competition whose sponsors include the Biko Foundation and Xarra bookstore, films festivals and music concerts.
Biko spoke of a time when Africans could stand proud and take their place in a society that transcended race and was based on equality.
Quoting his father, Nkosinathi Biko says this "glittering prize" was still on "the distant horizon" for South Africa.
Perhaps those young people wearing the hero's face on their chests will be inspired to find it.
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