That's what having a funded and functional defense is all about -- making other entities not think that the opportunity is there.
I think the planet has relatively finite resources and that I'm god damned lucky to have been born into a nation with the ability to secure resources for itself. I enjoy my quality of life a great deal and would like to maintain it. At a minimum. Before helping others.
If you're the type of person who thinks we should just give up this position by not adequately defending it through military and technology investment, I would prefer that you just expatriate yourself now rather than let some other ascendant nation dictate our future and our quality of life.
If you're the kind of person who feels strongly for the plight of, for example, the Palestinians, you should recognize that the only way to deter those kinds of outcomes is to establish the means to establish and maintain sovereignty. That requires a combination of force and manpower.