The argument works either way.
Either they looked like explosive devices, in which case the police acted properly, or they looked harmless but could have been explosive devices, in which case the police acted properly.
Ted Kazinski put bombs inside of bits of wood. Remember that? A person was nearly killed when he attempted to move what he thought was a bit of scrap lumber.
It turned out to be one of Teds early experiments and IIRC the victim was very seriously injured and lucky to not be mortally wounded.
The folks who dreamed this little 'publicity stunt' up are morons. The ones who they hired to place these devices are morons. They all deserve criminal charges, speedy trials, appropriate prison time, and in a just world a good old fashioned ass whooping.
L