It's not just the rockets, but the entire terrorist network which launches them that poses the greatest threat to Israel. The rockets by themselves can be handled, but it's ignorant to just look at them in isolation. Because movements like BDS exist, people have looked at the effects of international condemnation and honestly, it's not having a strong effect on Israel. BDS "victories" are usually overblown and ultimately not that harmful to Israel, for example SodaStream relocating from Palestinian areas. SodaStream did suffer minimal economic losses... but they overcome it, unlike the Palestinians who appreciated their jobs (even if their bosses were Jews).
The rockets are part of a terroristic machine that is not subtle about wanting to destroy Israel. At best, they'll expel most of the Israeli populace if the win; at worst, they'll follow through on their actual threats of genocide. And groups like Hamas have never stopped working for such explicit goals, always dismissing peace as a viable option. So when people are reporting that Israel is responding to the rockets, they usually omit that they're responding to so much more. What about the tunnels to smuggle in weapons, or those seeking to enter Israel illegally with weapons to cause death and panic? Even looking at just the rockets, their damage may not have the range of a missile but they're still devastating to the area. Israel does have the Iron Dome, and a lot of people ignorantly just point to that and say that Israel is fine... ignoring that the device costs a lot of money and is not a sustainable option. Especially when you consider the rockets cost only hundreds of dollars and leech off of donations to the Palestinians, so it's not as much of a burden on the Palestinian leadership (the populace who sees that material diverted away from projects to help them are another matter, though).
The International Community does pick on Israel, because it's the safe bet. Most of it is pandering to the Islamic nations, and an unwillingness to tackle the actual nations causing problems. Israel is safer to criticize than China, for instance, who is barely brought up negatively if at all in the UN. Still, Israel maintains strong relationships with most nations on Earth, and let's be blunt: The ones they lack relations with aren't causing them to suffer. Do you really think they care if Pakistan fails to recognize them? Granted, they'd love to establish relations, but it's not so vital that they'd throw themselves at their feet begging for relations. Still, with the relations they have, Israel works to maintain those relations and I think most of the world leaders recognize that things aren't so simple for Israel. Israel proves itself to be worth keeping, so they're not concerned especially when those who see the bigger picture realize that it's not the demonic caricature most paint it as.
Israel is pushed to respond and you may find it disproportionate, but at least recognize that they're not doing this solely because they want to. With how much they have to spend on defense, it really isn't something they can do or justify to themselves without good reason. They forfeit tactical advantages to make sure people get out, and other military leaders have commented that no one goes to the lengths Israel does to minimize collateral damage. Ethnic cleansing claims, at least in modern claims, are a joke: The Palestinian population has not grown as strongly as they have under Israeli administration. Granted, some of it is general medicine getting better...but increases are directly related to Israel's presence, indicating that they have access to their medicine and hospitals. Israel cares about peace, which is lost on people who fail to understand the big picture.
Israel would end the occupation if they thought it would lead to a VIABLE peace. As I've said before, polling has shown that Palestinians are unfortunately not open to peace, and looking at their leadership you'll find that any Palestinian leader pushing it is only doing so in English (and not in Arabic) and that their rhetoric is empty. It's only to appease international donors. Israel was willing to pull out from the Palestinian territories, making offers they could not renege on if accepted...and it was turned down, without a counter offer. It was nearly everything the Palestinian leadership claimed to want. The government in Israel at the time would've followed through, and that was proven when years later they withdrew from Gaza. That was a DISASTER, so land-for-peace was shown to not be the answer. They need more, which goes counter against those who blindly think that such things will somehow end the conflict. It won't, and pandering to blind "occupation" rhetoric will not help them especially when it comes to all-or-nothing terrorist groups and their donors using them as proxies.