I agree with that.
I've seen this before, as we all have. Everyone acts a bit strange in these situations as would most of the hyper-critical and ultra-suspicious folks who comment here. These parents and relatives aren't on a job interview or a TV game show. This is life and death in front of a hundred cameras, microphones and milling police, FBI agents and the simply curious. They are sleep-deprived and often scared and confused as anyone would be.
I see so many nasty posts making wild accusations and inferring all kinds of horrific plots and schemes by the frazzled families of lost or abducted children. It's sad that we leap to the worst conclusions in these tragic cases. Maybe there is something to be 'suspicious' about in the Smart case but probably not.
I'm also wondering about the odd statement the uncle made and it does sound like a possible runaway explanation but who really knows at this point? I'm willing to withold judgement for awhile until we know more. If this were my child gone missing for this long, I would probably be incoherent by now and thus, accused of 'not acting right' by many that post on these threads, all full of suspicion and instant judgements about someone they don't know, based on a 30 second edited TV clip. Let's give these folks a break, they have enough to deal with.