I blame everyone : grid operator and wind farm operators.
Not a good description of the real problems. It's well known wind turbines do not work well in stormy weather. They should've had more gas turbines fired up, ready to switch in as the inevitable wind turbine shutdowns happened. As the storm approached, South Australian electricity sources were (approximately): 18% gas turbines, 47% wind turbines, 35% imports from Victoria. They did not have nearly enough gas connected to the grid and were just not prepared in any way. As if they just expected to sail through this. A second mistake they made was running the Victoria interconnector nearly flat out. With inevitable wind turbine failures, the Victoria interconnector was the only source they had that could be quickly switched in to cover for lost generation. South Australia has no hydroelectricity to speak of, which is a source that might normally be expected to fulfill that role. If the interconnector was already nearly maxed out, as it was, no reserve capacity could be quickly switched in. So: zero grid resilience.
Of course the loony hippies don't want resilience. They'd like you all to be off-grid.
Incompetence then. By everyone. The grid operator, wind farm operators. Yes, those who supplied the wind farm software should've made it clear their software was made to protect windfarms from catastrophic grid failure. But then, the wind farm operators should've known that. They must go back to school to study Energy 101 before being allowed out to play again.