(1) Yes (2) “Sentient” is a better word. Man tends to be selectively compassionate. (3) The suffering is pretty imaginable, as is the torment, and it is all purposeful and thus needful. There is also a lot of pleasure, including very simple pleasures obtained from just looking at the horizon. (4) Life is not purely abuse, and we do not even know what the “cutoff” for heaven is.