Posters of the people being held hostage by Hamas after its attack on Israel last month have become visible all over New York City, the country and the world. The artists who created them did so to raise awareness and support. But as much as the posters have inspired many, they’ve angered others who are critical of Israel’s actions and history in the conflict with Palestinians. That’s made the posters themselves a flashpoint, and led to some very public acts of the posters being torn down, often caught on social media and condemned in turn with its own outcry.