<<You'll note that the great circle path from St. Petersburg to Paris goes well to the north of Poland.>>
Beautiful. Now let's see St. Petersburg to Lyon, or Marseilles, or Rome or Naples.
And Poland seems close enough to the part of the trajectory that overflies the Baltic. Who says the shield has to sit squarely athwart the trajectory? Why can't a Polish site intercept the Russian missile over the Baltic?
And while you're at it, let's see the trajectories of any rockets launched in flight from a mother rocket.
I don't know jack-shit about rocketry but I can keep raising questions as long as you keep throwing up factoids. That's why there are experts, real experts, not do-it-yourself armchair experts like me, whose opinions on matters like this don't mean jackshit.
When the U.S. produces a credible expert with a solid academic reputation at a leading university who is willing to go on the record to say that the Polish defences can't protect a NATO site, then I'll give it some credence, and otherwise I won't.