I don't think the raid in itself was a bad idea, as far as military matters go.
I think the decision to continue with the mission, after it was apparent that the militia there had been tipped off, is a fair criticism.
We aren't privy to the intelligence that suggested why the raid would be a good idea in the first place so we don't know to any specific extent what they actually thought they were going to find there. I imagine it must have been of some significance.
If not, why bother with going to raid it in the first place.
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No, it doesn't. But I think assigning the kill to Osama bin laden entirely to the Obama admin is dishonest. While true the discovery of the compound and the operation happened on Obama's watch, it was a culmination of intelligence from both presidencies that were ultimately responsible.