We can't really blame him for sure for what he just did. Bitcoin doesn't have that much value way back before, and because of him buying pizza's for tons of bitcoins, it introduces the value of bitcoin to people. But try to do the same thing today, buy items, goods and services through bitcoin as it is the best means to introduce bitcoin to people. By simply asking if they are accepting bitcoin, it will already trigger their mind what bitcoin is. The bitcoin-pizza event was truly historic and worth to commemorate, I hope soon, we'll not going to rely on the dollar value of bitcoin, thus, with it intrinsic value.
It feel silly to criticize someone for past actions that he had no way of knowing the repercutions in the future. He was invested into crypto way before most of us, and we only got here because of people like him using bitcoin in the first place, so I'd cut him a bit more slack. I agree with you in that we can't blame him for not knowing, nobody knew..
Anyone who is criticising would have done the same or worse, this was a time when lots of people where ignorant and have zero knowledge about btc and its possible potential, I don't blame him, he is not a time traveller or fortune teller, he did what he felt was the right thing to do at that time,
We are all saying this now because btc was able to increase in value, assuming the reverse was the case, nobody will be talking about this, don't forget back in that time btc was tagged as scam, but now people see things differently.