A) The sailors needed to die in order to preserve the secrecy of the Amazons existence.
B) The Amazons never showed joy when they killed. The mother of a boy child was even shown as being devastated when it was taken from her.
C) Mmm, yes, seduce and leave. Sure, no one will notice that dozens of superhuman women show up around the coastal cities of the Mediterranean every 30 years or so for a bit of snu-snu before vanishing in row boats.
D) You seems to confuse hatred for what the Amazons consider a necessary action.
So can I ask you something; is Ra's al-Ghul a combined man and woman hater because he's killed hundreds of thousands of each? Is Vandal Savage? Brainiac? Is the US a Japan hater because it felt it needed to wipe out two cities along with thousands of civilians rather than target the armed forces only?
A. A clear disregard for their lives and like I stated there were alternate ways around it.
B. Most mothers have an emotional connection to any children born of them. It still doesn't change that Amazon society as a whole considered males worthless and unworthy of life.
C. A way easily around that is instead of procreating every 30 years or so space it out more so a few women every year or so go out and maybe go further inland. It would take a bit more effort, but is doable.
D. It is not necessary the way they do it. It is the easiest way with again a clear disregard for male life that easily comes across as hatred.
As for the others you mention, different cultural backgrounds so trying to equate them is most likely a mistake. But, from what I know Ra's Al-Ghul thinks little of humans in general and thinks women are inferior. Vandal Savage thinks only of himself. Brainiac I doubt hates people because that puts too much emotion into it. All of them think they are superior so other beings are not worth hating because they are so far beneath them. They are like ants. And may easily be what the Amazons as well. If so, frankly in their case I do not know which is worse.
Also, going back to the original post it raises the question of why Wonder Woman has concern for the lives of others including men when by all accounts the culture she was raised in at best (or worse) has no regard for the lives of men and engage in a practice that was considered barbaric centuries ago or based on comments they made as well hate men in general.