Being afraid of a terrorist attack on a nuclear plant is an unreasonable fear. A nuclear reactor isn't a nuclear bomb. Suppose they actually access the plant, how are they suppose to turn it into an actual cataclysmic event? The amount of logistic, knowledge and luck required to turn it into an actual threat is higher than many other alternatives.
Are you so sure?
What if someone blew up the primary loop pumps and emptied or blew up the cooling pools?
That's 2 bombs and then you have an uncooled pressure cooker full of fissile material and other nasty fission byproducts in a place that's become out of reach because of the massive radioactivity from the uncovered used fuel.
It may not go full Tchernobyl, but it definitely may go Fukushima-style.
This fear of a terrorist attack on a nuclear plant is again largely exagerrated and fed by the anti-nuclear activists. They want the mass to perceive the nuclear plants as a perpetual, constant and actual threat against the human kind.
Agreeing with you here.