are you on this line of reasoning: most terrorist organizations claim responsibility, since they commit the act exactly to gain attention (towards themselves and their cause), and since ObL has not, coupled with the lack of published evidence against him, that makes the case against him very weak? -------
just fyi --
bin laden has never actually claimed responsibility for the bombings of embassies in kenya and tanzania, though he has said he supported the actions.
http://www.cnn.com/LAW/trials.and.cases/case.files/0012/embassy.bombing/ overview.html http://news.bbc.co.uk/hi/english/world/south_asia/newsid_1551000/1551100 .stm
this report by cato has some interesting background on terrorist attacks against the u.s.:
DOES U.S. INTERVENTION OVERSEAS BREED TERRORISM?
http://www.cato.org/pubs/fpbriefs/fpb-050es.html