Americans do that sort of thing? I like Israel, thoroughly supporting their right to live, free from attack and terrorism, designed to destroy that country, despite the long term, long time, internation legal recognition as a recognized country, not just in the courts or UN, but around the world in countries and governments far and near, except for rogue regimes. Still, I would never put that belief on a license plate, on my car or a yard flag. It would simply never occur to me, and now that it is brought up, I reject for my personal use, though, really care not, one way or the other for others use.
Some people are anti-Semitic, sometimes, even radically so. In this day and time, it sometimes does not pay to personally advertise. I support the 2nd Amendment, and quite often carry, loaded, locked and cocked (the only intelligent way to carry), but, I carry concealed. It does not pay to advertise, and can make one a target, of people who might target you covertly, due to your out front display, without you knowing you have popped up on somebody's radar. This gives them an unintended advantage, enabling planning or committed movement, while the open carrier is unaware. There simply is no personal advantage to visually advertising your stand.