Anyway I don't think the concern is that they would target or otherwise intentionally sabotage the reactors -- but that nonetheless they would allow something bad (potentially seriously bad) to happen by pure neglect. Kind of like the way they managed to blow up Reactor 4 in the first place back in 1986.
And of course you can wait until the wind is blowing in the right direction.
Yes, there would be consequences. But there are also consequences for going on a random shooter spree, and they don't stop random shooters.
If you attack that infrastructure, the core will melt down without suffering a direct attack.
IIRC, that's what happened at Fukushima: a tsunami took out the backup generators, which shut down the core cooling system, which then led to the core overheating and melting down.