Sympathies translate into trade policy, arms embargoes, diplomatic recognition, and votes at international bodies. The idea that soft power is meaningless because it isn't a missile is a contradiction in terms. Europe is Israel's largest trade partner. That's not nothing.
Also, "there is no international law" is a strange argument to make in defense of a country that spends enormous resources lobbying international institutions and running influence ops in allied democracies. If none of it mattered, why bother?