Because it's not true. Bad weather regularly disrupts travel and normal services in a number of countries, not just Little England.
You hear it time and again, each and every winter, when heavy snowfall is met by headlines like chaos, BIG FREEZE or COLDEST [month] SINCE RECORD BEGAN.
Or, if not "since record began", then maybe the coldest for 20/50/90 years, or since 1962, depending on the article you read. Or, perhaps, even, "AA's busiest night for breakdowns in 25 years" - anything as long as it's a superlative sentence.
And the panicky headlines are invariably accompanied by the usual "Why can't Britain cope with snow?" and "why do we grind to a halt at the first snowflake and other countries don't"? Google those words and you'll find the very same question cropping up dozens of times and not just from this uber-cold 2010 or 2009, but all the time.
And yet it wouldn't take much to clock that weather-related self-flagellation is complete nonsense.
While it's obviously true that the weather is being incredibly disruptive, similar levels of chaos (and casualties, in some cases) are reported across France, the Netherlands, Germany and Scandinavia as well as throughout Spain, Italy and also Eastern Europe.
Last year was a similar picture, with a nasty cold snap forcing airports to shut, not just in the UK, but also in other countries like Germany, Switzerland, Spain and Northern Italy, etc.
Why some people want to believe that whatever happens on their doorstep is only happening to them and them alone remains one of the mysteries of Clicheland.
#5 "Students should engage in the democratic vote...".
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#3 "There are jobs out there if you really want one".
#2 "The Royal Family brings in tourism revenue".
#1 "Iain Duncan Smith is a kind and honourable man"