Seems like a hell of a coincidence for these two things to happen on the same day...
Then these new claims are made in the media and they risk not only Wright himself moving the evidence, but also hordes of potential 'treasure hunters' breaking in and stealing things like hard drives in the hope of finding bitcoin - hard drives that also contain things the ATO might want to look at.
And so a pre-emptive raid to take the evidence, before it gets taken by others.
This could be some guy feigning humblebragging to fool prospective customers, or the vaguest individual Wired decided to hoist the label onto because it garners eyeballs in a Daily Mail way that's hard to repute.
The raid is explained because many governments want evidence for tax evasion and evading the conventional banking system... control SN = control BTC.
No one is that afraid of the bitcoin community, or of bitcoin itself. The bitcoin fringe is only novel in their application of the blockchain towards the problem of reducing the risk in organized crime. The world has heard the anarchist, anti-bank rhetoric before, and for that matter, from groups that actually blow up banks and murder people to further their goals.
There seems to be no evidence of any government seeking to "destroy bitcoin in any way possible." One would expect there to be fewer bitcoin based companies openly operating if that were the case. Rather, it appears that governments have reacted to bitcoin by defining it in terms of their existing regulatory frameworks, and deciding whether or not, and how, it can legally be used and taxed.
So yes, it does seem a bit ludicrous.
It's a decentralized, open-source protocol. SN couldn't do anything to it if he wanted to.