Justin had plenty of time to vote in different witnesses with his stake.
He didn't, which means he trusted the ones we have (as do I), to keep the chain secure.
If I ever started tweeting contradictory gibberish; and couldn't be contacted for a week I'd consider it a favour if the witnesses froze my stake and minimised my opportunity to damage the chain, at least until I had a chance to discuss it with them.
I don't think this will be a big deal. He bought into a chain controlled by witnesses; those witnesses used their best judgement in temporarily locking his stake.