For three months, the Arab world has been awash in protests and demonstrations. It's being called an Arab Spring, harking back to the Prague Spring of 1968.

But comparison to the short-lived flowering of protests 40 years ago in Czechoslovakia is turning out to be apt in another way. For all the attention the Mideast protests have received, their most notable impact on the region thus far hasn't been an upswell of democracy. It has been a dramatic spike in tensions between two...