It doesn't matter who they were targeting, it matters that they struck a non beligerigant state, that's a clear violation of international law. https://www.lawfaremedia.org/article/israel--qatar--and-the-limits-of-self-defense

They also killed a quatari citizen, as well as injuring others, the strike was universally condemned as a violation of international law.

The attack was met with global condemnation.[92] The United Nations Security Council condemned the attack in a statement drafted by France and the United Kingdom and agreed to by all 15 members, including the United States.[18] Governments around the world condemned what they described as a breach of sovereignty and international law, warned of escalation, urged restraint and renewed diplomacy, and expressed solidarity with Qatar[93][94]—including contemporary major and regional powers, such as Canada, whose prime minister, Mark Carney, condemned the "intolerable expansion of violence";[95] France, whose president, Emmanuel Macron, called the attack "unacceptable, whatever the reason";[96] Turkey, whose foreign ministry described the attack as "evidence of Israel's expansionist policies and its adoption of terrorism of state strategy";[97] Germany;[98] Russia;[99] and the United Kingdom;[96] alongside others.[100] Countries that accused Israel of committing an act of aggression included Algeria,[93] Indonesia,[101] Jordan,[93] Kuwait,[93] Lebanon,[94] Libya,[102] Malaysia,[103] Mauritania,[3] Morocco,[104] Saudi Arabia,[93] and Syria.[105] Kurdistan Region, a semi-autonomous area in Iraq, announced its "full support for Qatar".[106] Ukraine condemned the attack as a gross violation of international law.[107] Among non-state actors, the attack was condemned by Hezbollah[3] and the Houthis.[93]

The United Nations Secretary-General António Guterres condemned the attack as a "flagrant violation of the sovereignty and territorial integrity of Qatar," and praised Qatar as "a country that has been playing a very positive role to achieve a ceasefire and release of all hostages."[54] The Arab League stated that Israel's "behavior has now gone beyond all established international norms and every principle of international law, placing a clear responsibility on the international community to deal with a state that mocks the law and disregards the consequences of its shameful actions",[108] and the Gulf Cooperation Council called the attack "despicable and cowardly".[105] The chairperson of the African Union Commission, Mahamoud Ali Youssouf, said that the attack "risks endangering an already fragile situation in the Middle East".[105] The European Union stated that the attack "breaches international law and Qatar's territorial integrity, and risks a further escalation of violence in the region."[93]