Well, yeah, that's what one would think.
On the other hand, the very fact that the Kursk had survivors on board after two catastrophic internal explosions is testiment to the Russian designers.
I used to be very skeptical of the claims of how solidly the Russians built their boats, until only very recently. If its a matter of bringing the 33,000 tons of total destruction to the bottom or not, I'd think that one would aim for a weapon that absolutely got the job done.
Keep in mind, if you fire at a Typhoon and miss, that means its going to be firing several dozen nuclear warheads at its earliest opportunity.
Not even the Blackshark has that kind of pressure on it.
Cheers,
David