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molten salt reactors (the kind in the comment at the top of this thread) are at atmospheric pressure, and are designed with a drain plug which isolates the (very hot) materials from the neutron source, after which they cool down happily on their own in a separate but similarly shielded compartment.

release of materials is one of the most unlikely outcomes ever.

The addition of uranium or plutonium is unnecessary for operation of a LFTR, rather it is being sold as an extra advantage that a LFTR can safely consume the waste already created at PWR's. Consuming PWR waste in a LFTR is a better option than burying it in the desert (at least it is to some).

I've been trying to imagine how blowing one of these things up with shaped charges, or anything else, is worse than blowing up other things like industrial plants, gas stations, etc.

The radioactive fuel is a molten salt, so it will cool and solidify soon after dispersal. It is certainly not good, but is it really worse than say, a chemical plant?

The radioactive stuff won't remain airborne after the initial blast, so that means a predictable and small area to remediate.

The fuel dispersed in an explosion can be collected, since it will solidify, so it won't poison the water table.

While not perfectly safe (nothing is), the disaster contingencies seem fundamentally different and better than those from a PWR + solid nuke waste disposal site.

There would be many more of them, which is both good and bad for various cases.

That's an answer to how almost anything can be released.

Petrol from a tanker? Shaped charge.

Cracking armored vehicle? Shaped charge.

Unlocking stuck door? Shaped charge.

It really does seem people try to downplay any potential reactor designs because global thermonuclear war may damage the reactor. Stop living in fear.