That's a very naive take on it.
NATO has proven themselves to be "a little more aggressive" than you describe on a number of incidents.
- NATO intervened in the Kosovo conflict without United Nations Security Council (UNSC) approval, launching a 78-day bombing campaign against Yugoslavia (Serbia and Montenegro)
- Under a UN mandate to impose a no-fly zone to protect civilians, NATO launched extensive airstrikes against Muammar Gaddafi’s forces. However, NATO went beyond the resolution’s scope by actively aiding rebel forces and contributing to regime change.
- Although NATO promised in the 1990s not to expand eastward after the Cold War, it has since admitted several former Soviet-aligned states.
- NATO had prolonged involvement in nation-building and counterinsurgency in Afghanistan, which raised some questions about whether it had exceeded its defensive-only mandate.
NATO has a history of, under the guise of "providing reactionary defense forces", going beyond that scope, and trying to convert the non-westernized counties they're operating in, to westernized ones aligned with North American and Western Euro interests.