I'm prepared to make the call that SBS has over-reacted in sacking Scott McIntyre.
Yes, it is easy to find a breach of the SBS Social Media policy, if only because the Twitter account doesn't include a disclaimer that the views are his own - as recommended by the policy.
The tweets themselves - four in total - are opinions of ANZAC Day and Australia's role in war that are shared by a minority of people (though not by me), but they are not unique nor offensive. Given the social media code says the values are "creativity, collaboration, diversity and respect" one could argue the posts reflect on diversity. SBS more than most should acknowledge this is NOT a mono-culture.
They are poorly expressed - and are framed in a way that they fail the respect test.
But this is a counselling issue not a sacking one. These are not abhorrent views, they do not bring SBS into disrepute.
The only thing bringing SBS into disrepute is the reaction of the CEO.