Do chemical plants have a giant bullseye on them?

A former homeland security adviser to President Bush is saying that the government is not paying enough attention to security at chemical plants in the US, which one report says there are close to 15000 in this country. This issue has become perhaps more urgent after the train wreck in the Carolinas that caused a large quantity of chlorine to be released, killing 10 people. Many, nearly all probably, of these plants have little or no security, and a terrorist could just release the stuff in the air and kill quite a few people if the plant is in a populated area. The report mentions that 100 of these plants are in highly populated areas. If a terrorist managed to steal a large quantity of it, perhaps in a truck as its being shipped, they could release it just about anywhere and kills hundreds or thousands of people.

Here is a link to the story if you want to read it:
http://story.news.yahoo.com/news?tmpl=story&cid=676&ncid=716&e=24&u=/usatoday/20050426/ts_usatoday/chemicalplantsvulnerabilityatissue