Israel has responded to Hamas by trying to minimize civilian casualties. Does Hamas fight that way? Of course not. They specifically target civilians. Hamas needs the support of their civilians to survive. Do you think Hamas fighters dig those tunnels? Of course not.
If Israel can break the civilians will to fight, their will to resist, their will to support and be subservient to Hamas, their very will yo live, Hamas loses its support mechanisms and will eventually wither and die.
Hamas has set the ground rules. Israel needs to respond in kind.
If your enemy does not apply Geneva, than Israel must fight as they do . No Geneva.
Geneva cannot be a suicide pact for only one side.