I am not
that knowledgeable in the matter (hence I may be wrong), but the plasma may be only a first step.
I don't know if 2.6 ATM is enough to fuse H2 into He and/or split He into H2 (isn't this that's supposed to happen on long term?)
So basically even if one would explode it will still be contained, there is no way for the amount of energy in a fusion reactor to keep building to generate a larger explosion, that energy build-up would again quench the reaction.
Here I agree, just, as I said, I expect to see there much much more than 2.6 ATM (and also "a bit" of heat).
Humanity has spent millennia dreaming about flying, now it's a trivial thing, the first electric car is more than one century old but they were considered impractical for most of the time till now.
And we dreamed about flying to the stars and no luck yet, and we dreamed about running cars with water and no luck yet (although solar panels + water => hydrogen may not be that far from that).
Some dreams came true, some others not. Or not yet.
I do hope I'm too pessimistic and we get to have free energy with basically unlimited supply, maybe even during my lifetime. But I won't hold my breath for that.