Some people want peace but don't want to have to contribute either money or boots-on-the-ground to a peace force.
How do they suggest we make sure that peace continues, then? It cetainly won't continue unless peaceful people make sure that it does.
That means, first of all, that we must look beyond our own coastline and know what is going on elsewhere. If countries are tearing each other apart or invading other people's territories, or harassing a location with desirable assets until it gives them away in exchange for a promise to think about peace deals "later" then it is only a matter of time before violence escalates to affect other countries. We can't turn our backs and pretend that danger does not exist.
Secondly, we need friends, and those friends need us. One emblem of Rome was a bundle of sticks tied firmly together. It was a symbol of the strength of unity. One stick can be easily snapped, but a bundle with strong connections withstands attempts to break it. NATO was one such bundle, but it is under stress from the US threat to leave. Our ties and connections with other countries who value peace and co-operation over taking over territory and control by threats have to be kept positive and alive by discussions and common aims, and more countries added who want peace and are prepared to foster it.
Thirdly, there is a need, right now, for sensitive peacekeeping forces in several volatile (or worse) places. That, however unpalatable and unpopular the thought, can only be done by real people, not by distant surveillance and unmanned weapons. Those may detect buildups of military vehicles, but they can't do as well as an intelligent, humane and well-trained peace force.
Fourthly, all three of the previous paragraphs take money. You can't run organisations to collect information, keep allies friendly, informed and in sync with plans, and train, equip, lead, and support a corps of peacekeepers, without money. The US have supplied quite a lot of that (though almost certainly not as much as Americans think it has cost them) but there is a possibility they they will cut that spending, or even quit contributing to or taking part in any defensive initiative outside the States.
If we want peace, we have to pay for it, in money and in preparedness and in putting in the work to create a climate of co-operation between nations where it can thrive.