It's literally only function is a deterrent to war, including by members against others as they will not gain NATO support unless they are attacked.

It's expansionist against the wishes of outside countries, and NATO exerts military pressure on the Global South.

Its members might exploit, but thats a meaningless statement about NATO itself because without NATO there would literally be more war.

Bzzzzt wrong. NATO's only function is to preserve Western Hegemony and dominate the Global South militarily, so that member-States can continue exploiting ruthlessly unopposed. This results in proxy wars, such as the Israeli genocide of Palestinians.