Because the statement "all gray rabbits are rabbits" is true, it follows by analogy that the statement "all suspected criminals are criminals" is also true.
The author concludes that the statement “all suspected criminals are criminals” is true. He supports this with an analogy, saying that the statement “all gray rabbits are rabbits” is also true.
The author analogizes between two things that are not relevantly similar to one another. Just because all gray rabbits are rabbits doesn't mean all suspected criminals are criminals, because the connection between being a gray rabbit and a rabbit is different from the connection between being a suspected criminal and a criminal.
Gray rabbits are a subset of all rabbits, but suspected criminals are not a subset of all criminals. Some suspected criminals may indeed be criminals, but some may not.
The reasoning above is flawed ███████ ██ █████ ██ █████████ ████
the relationship between █████ █ ████████ ███ █████ █ ██████ ██ ███ ██ ███ ████ ████ ██ ████ ███████ █████ █████████ ███ █████ ████
the relationship between █████ █████████ ███ █████ █ ██████ ██ ███ ██ ███ ████ ████ ██ ████ ███████ █████ ████ ███ █████ █ ████████
the relationship between █████ █ ████ ██████ ███ █████ █ ██████ ██ ███ ██ ███ ████ ████ ██ ████ ███████ █████ █ █████████ ████████ ███ █████ █ ████████
not all rabbits ███ ████
not all criminals ███ █████████