Polls are valuable but they do not indicate without further information being gathered by the pollster whether those responding to the poll have even the faintest knowledge about the countries that are being ranked. Even a simple question like "Are the Iranian people Arab?" or "Who was Ayatollah Khomeini?" might give a good idea of whether those polled have any factual understanding of Iran. As for American opinion about Israel, it might as well be a printout of talking points from the Netanyahu administration. Never has "received wisdom" been a more appropriate phrase than when applied to public opinion.
Turkey launches heaviest air strikes on PKK since campaign began, official says (Reuters)
from the article: Poll: Americans view Iran as most unfavorable country