Clinton, and I'll interject that I don't like him here, was a typical president. Like almost all of the others before him, he simply filled the void.
Now, why did the Muslim radicals attack us? The answer is a little deeper than a "weak" Clinton administration. How would one categorize the previous attacks from years past? If you study history, you'll see that is/was at least 50 years of failed foreign policy, and, gasp, religion.
Walter Williams makes a partial case here.
"The Muslim world is at war with Western civilization. We have the military might to thwart them. The question is: Do we have the intelligence to recognize the attack and the will to defend ourselves from annihilation? Their intent is clear, but let's refresh our memories with a bit of history.
At the 1972 Olympic Games in Munich, several athletes were massacred. In 1979, the U.S. embassy in Tehran was taken over and 52 hostages held for more than a year. In 1983, U.S. Marine barracks in Beirut were blown up, killing 241 U.S. soldiers. In 1988, Pan Am flight 103 was bombed, killing 270 people. In 1993, there was the first bombing of the World Trade Center, and in 2001, it was reduced to rubble, killing more than 3,000 Americans. In 1998, U.S. embassies in Kenya and Tanzania were bombed, resulting in more than 200 dead and 4,000 injured. Who are the people responsible for these and other wanton murders of innocents, including the recent barbaric beheading of two innocent men? They were all Muslims."
http://capmag.com/article.asp?ID=3755