> If something is that dangerous, shouldn't there be armored escorts, lojacks and all sorts of other security measures on it?

I think you underestimate just how common this and similarly dangerous chemical substances are. Every large hospital that does radiation therapy has this stuff.

> Isn't it criminally liable to transport something this lethal so carelessly?

You probably mean "criminally negligent", and I don't think the "standard of care" criterium extends to defending against malicious third party actions.