Israeli expansionism will end the day the US threatens to bomb Tel Aviv if it continues.
So in other words, Israeli expansionism will never end.
Hopefully the US will one day force Israel to stand on its own two feet. Cut from the US massive fiscal, military and diplomatic support the state might actually collapse. Or it might nuke everyone. Or it might become a rational, modern state.
These attacks into Gaza are not about expansion, but about retaliation for rockets attacks.
No, they're not. The Israelis like having rocket attacks. They never hurt a serious number of Israelis (and they rarely, if ever, kill any) while providing a good excuse to launch this kind of invasion, reinforcing the walls of the Gaza open-air prison. If they didn't want rocket attacks, they could sign the dozens of peace initiatives and unconditional ceasefires the Gazans have offered.
It's stupid (for others; not blaming m52 here) to equally blame Palestinians and Israel. Israel is a developed, organised state run by an advanced defence force. Palestinians are, potentially, some kid with a bottle rocket or a guy recently out of jail with a grudge. You can't demand the latter be reasonable on condition of the former not using their actions as an excuse for murdering every Palestinian in sight,
Also, can I make it clear that I support Israel, to the extent that the phrase has meaning: I support the existence of a State of Israel within its actual borders enjoying peace with its neighbours. In my opinion, the people calling for or responsible for Israel's very aggressive foreign policy do not support Israel.