Wow. I can honestly say I don't get any of that from the Twelfth Doctor. I see a man who has to make hard choices all the time, and has let himself become hardened because of this. He doesn't like seeing people in pain or dying, but he doesn't allow himself the luxury of agonizing about it because it doesn't help anything. He's a very pragmatic Doctor.
I admit his treatment of soldiers this season is odd, but I attribute that to his distaste for war in general after spending a thousand years trapped fighting a seemingly never-ending war on Trenzalore...and that he sees himself in the soldiers he meets, and he hates that.
And the Doctor "just shows up to watch people die because he thinks it's funny?" What? He absolutely tries to save people, but when he knows they're beyond saving he moves on to the next thing that might be able to help the next person. Like I said, pragmatic.
I think Twelve will soften quite a bit by next season. As I've said before, they seem to be redoing Hartnell's arc - start off with a grumpy, distant, kind of scary old man that you're not sure if you want to be around, and slowly turn him into a lovable grandpa/mentor character. Which makes sense since he's the first Doctor of a new regenerative cycle, and Hartnell was the first First Doctor.
Anyway, I hope you can come to love Capaldi the way I do. He's not callous or cold, he's pragmatic and impatient, but keeps people at arm's length. Sooner rather than later, he'll grow more fond of people once again, and he'll stop being such a dick to everyone. (But I'll be sad when that happens, because I love how much of a dick he is to everyone. I think it's hilarious.)