I don't think the poster said the US and Israel don't commit war crimes. Only that Iran also commits them.
Article title is typical manipulation. "Something happened" as "something else also is happening". :) Very common technique. News website skimmers will conflate the two. Nobody who read the title will go back after 1-3 months to ask what was learned since about what happened, and that will be it.
News websites commonly use this for pumping up xenophobia against immigrants, too, where I live.