Sadly, there are some who might seek to deny the social benefits of diversity and the economic rewards that accrue to businesses and asset values from voluminous immigration programs.  Vehicle attacks that kill and maim may at first blush seem like something bad, but let's be honest, you don't make an omelette without breaking some eggs.  More people die from heart disease, so there is no point in taking any steps to stop vehicle attacks.  In fact, it's a bit racist to try.