In an editorial, the Boston Globe says: When the esteemed physicist Stephen Hawking announced his decision to boycott Israel’s Presidential Conference, a gathering of politicians, scholars, and other high-profile figures scheduled for June, the response was as predictable as the movement of the cosmos that inspired Hawking’s career. The conference chair, Israel Maimon, called the move “outrageous and improper,” while Omar Barghouti, a founder of the boycott, divestment, and sanctions movement that advocates protests against Israeli policies, declared, “Palestinians deeply appreciate Stephen Hawking’s support.”

In fact, the decision to withdraw from a conference is a reasonable way to express one’s political views. Observers need not agree with Hawking’s position in order to understand and even respect his choice. The movement that Hawking has signed on to aims to place pressure on Israel through peaceful means. In the context of a Mideast conflict that has caused so much destruction and cost so many lives, nonviolence is something to be encouraged. That is equally true of attempts to inspire cooperation on the Palestinian side.

Chances for a peaceful solution in Israel and Palestine are remote enough without overreactions like Maimon’s. Foreclosing nonviolent avenues to give people a political voice — and maybe bring about an eventual resolution — only makes what is already difficult that much more challenging.