The Jesuits are already getting their comeuppance from this Pope but they will outlive him. See how he canned their American magazine editor.
As to your cafeteria Christian charge: Based on what you say, (based on what Jesus said in the Sermon on the Mount, no Christian could fight to defend his country.
I'm not the world's greatest theologian but I would have to say that of all the advice Jesus gave, all the rules he laid down, this one that you chose is probably the most ignored of all.
I'm not Catholic, only educated by the Jesuits--but they have been in trouble with the Pope since at least the 1960s, and maybe earlier than that. But that's really beside the point.
Just because lots of people choose to ignore one of Jesus's teaching doesn't mean it isn't there. I quote Matthew 8:19-20:
And a certain scribe came, and said unto him, Master, I will follow thee whithersoever thou goest.
And Jesus saith unto him, The foxes have holes, and the birds of the air have nests; but the Son of man hath not where to lay his head.
Jesus says that following him isn't easy. It takes moral fortitute and sacrifice. Again, the morality of the death penalty aside, taking pleasure from the suffering of others is decidedly un-Christian.
My only point is that people who claim to take a moral Christian high ground really don't have much ground to stand on--especially when you consider Matthew 7:1--"judge not that you be not judged."