1). I said every OTHER civilised country...the obvious inference there is that the US is also civilised...of course it is! Your just degenerating the discussion
2). It does provide checks and balances but it is over 200 years old and parts are not particularly relevant now
3) I know not every founding father did own slaves or indeed agree with slavery, but some did...the point being, their thoughts and actions were based on an entirely different outlook of the world
4). The need to defend your home against marauding hordes, the plague, lynching slaves, hangings, shootings..."its just the way it was back then"...EXACTLY...so change things to suit todays society and drop the what is now a quasi-macho "right to bear arms"- it's not worth the shootings and massacres on your tv every other day and it is obviously more strict gun control would address this.