They used to be a symbol of peace throughout the world (the Northern hemisphere at any rate), but then a genocidal madman abused them as a symbol of violence and hate. Unfortunately, most uses of that symbol even in present-day U.S. still come from idiots wishing to emulate the aforementioned madman in glorifying violence and hate. There are some highly notable exceptions, e.g. in Native contexts but they're not nearly enough to reappropriate the symbol to good use, and this will likely remain the case for the foreseeable future.

Also, rumor has it that what Ye posted is actually the official logo for some weird UFO religion called Raelism. (Be warned that the Wikipedia article on them prominently displays that logo. You'll probably want to not look at it and/or engage at your own pace, so as to avoid any offense.)