Much like America itself, writer-director Alex Garland’s “Civil War” is a precarious sort of success almost in spite of itself, and despite being its own worst storytelling enemy. How? How can those circumstances lead to a movie still worth seeing? Well, see it and find out. Or find out if you disagree. Garland’s fourth feature, after the variously fantastical and eerie “Ex Machina” (2014), “Annihilation” (2018) and “Men” (2022), sticks to a straightforward narrative path; it’s the tone and rhythm likely to carve up audiences into warring factions. I found it coldly gripping, as well as a mite ham-fisted. At...