Hamilton said it best when he stated that including a BoR would imply that the Feral Government would have otherwise had the power to restrict rights such as the 1st and 2nd amendments - even though such power was never delegated. He was exactly right and that is the core reason why so many today assume that the government has the power to restrict the right to bear arms / restrict speech etc ....
I find the argument about ex post facto laws to be spurious at best since the Feral Government IS empowered to pass laws in many areas and this restriction is imperative and included rightly in the body of the constitution.
You and I may be the only two Hamilton non-haters at FR.