I'm really glad that you posted this. Thank you!
(a) Killing members of the group;
While I do not dispute that Gazans have been killed at the hands of Israelis, the only _targeted_ Gazans are the Hamas. Yes, we both know that innocents have been caught in the crossfire. That happens from both sides. About two weeks ago (just a few days before the current problems started) a four year old girl Gzan girl was killed when an errant missile fired at Israel didn't make it over the border and hit her house. I know that is not news for the West.
I argue that we kill less Gazans than the American government kills Americans, both per capita and percent. Not to talk about what America did to the Iraqis. However, our follies make the headlines and make people (rightly) angry, while those of other nations do not. If you want to (right) direct vitriol at the killing of innocents, then you have a lot of other nations to get through before you get to the level that Israel does it.
(b) Causing serious bodily or mental harm to members of the group;
Bodily harm we don't do other than that discussed in the above section, so lets talk about mental harm. It is very clear from every perspective that the mental harm that Hamas does to the Gazans and to the Israelis far exceeds that done by the Israelis to the Gazans.
(c) Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part;
This is a terrific point to address, and I wish that I could expand on it more. The siege of Gaza is in fact designed to cause the destruction of Hamas. The population is in fact suffering because of that, even more than Hamas. There is much contention of this, especially since Hamas is successfully importing and improvising weapons despite the siege. I don't suppose that it was reported in the Western media when the Hamas confiscated tons of aid from the UN, such as blankets, some time back.
Many Gazans, and indeed the Israeli viewpoint, see the situation as Hamas spending resources on weapons instead of on their people. Just as a single example, for years concrete was banned as part of the siege due to the fear of Hamas building tunnels and bunkers. That restriction was lifted about two years ago, and within a few weeks Hamas had dug a tunnel into an Israeli schoolyard with the concrete. That's right: no new homes, kindergartens, or infrastructure was built with the concrete, only a kilometer-long tunnel to do whatever your imagination will to an Israeli schoolyard.
(d) Imposing measures intended to prevent births within the group;
(e) Forcibly transferring children of the group to another group.