There is no way to know what Jesus would or wouldn't like. Most religious people interpret their chosen text in whatever way best fits their preferences and lifestyle. In this case, they like war, so that means Jesus also likes war: https://jonathanlarsen.substack.com/p/us-troops-were-told-ir.... It is trivial to find Bible verses supporting war if that's what you're looking for: https://www.biblestudytools.com/topical-verses/bible-verses-....

I don't think they literally believe it. They ostensibly espouse this for political purposes, but it doesn't appear they believe in any permanent objective or thing other than their own power and profit.