You may have not read my entire comment. I'll repeat that the lack of exports of Ukrainian and Russian wheat because of the war will cause a lot more poverty, and maybe even death in Yemen, than its own war. Add the entire middle east that survives on Russian and Ukrainian wheat, and maybe you can understand how Ukraine may be more important to the middle east than Yemen, which is already there.

so potentially interrupting the wheat trade with the Yemenis is much more disruptive than just killing them?

Yes, it may affect a lot more people. And not only in Yemen. Remember: a hungry mob is an angry mob.