Assault on identity

Calling Professor Clinton

Consider the following syllogisms presented by the inimitable James Chastek: 

Whatever is, exists now
Homer is a poet
Homer exists now as a poet.

Green [like all colors:] is moving at the speed of light;
Grass is green
Grass is moving at the speed of light

John is a man
man is a concept containing all individuals
John is a concept containing all individuals

Now, note than each of these arguments are a) valid in form and b) possess true premises. Yet the conclusion is...