If that’s the case why won’t Israel let civilians cross the border into Israel to prevent their murder?
Whether you agree with Israeli attacks or not, obviously the answer to this is because it's impossible to filter out Hamas terrorists, which is the main thing they're trying to prevent.
The rocket attacks may be, but the ground operation in Gaza is going to be anything but. There's going to be a lot of casualties on Israeli side before this is over and the first waves of wounded soldiers started coming into hospitals around Gaza right on the evening when the invasion started.