Bomb truck barrier - GIF

[Frank S]

Ranald; actually it is wishful thinking that before 911 things were more or less honky-dory except for limited factions. especially in terms of Islamist extremism as far back as the 1600's politicized Islam started becoming prevalent in the Muslim countries. Although one could argue it dates nearly a 1000 years earlier to 620 when a jihad against Christians was done in Spain, but that was not a political movement it was in actuality a religious attempt at ethnic cleansing.
the Waring factions bestrewn moderate or mainstream Muslims and the Islamic extremist who have been indoctrinated by radical Mullahs, much like what we call the left are trying to indoctrinate children in schools and universities in most western societies, have been going on for a very long time. Certain events have brought this to our attention though the correlations may not always be interpreted or realized such as 1951 when a Palestinian nationalist assassinated Abdullah at the al-Aqsa Mosque in Jerusalem. Fifteen-year-old Prince Hussein saw his grandfather die, and the next day carried a gun for the first time. A year later he was king. 6 days of 1967 Iran in 1979, Iraq & Kuwait 1990
There are far too many events throughout history that have led up to the need for barriers to block vehicles.
And to be fair these are not limited to any single facet or sec of people their ethnicity culture political or religious beliefs or lack there of