I would say that any problems here in Calis are fairly random, however when we bought our house some years back we paid particular notice to whether our location would be occupied 52 weeks per year, with the boom in building over recent years, there are a number of places that become like a ghost town over the winter months, obviously this makes it much easier for burglars at a time when money is tight.
Home alarms and security cameras are still very much the exception rather than the rule over here and although they do not guarantee you will never have a problem, I think they do make a difference.
Finally, don't get burglary problems out of proportion, CBF is a fantastic community where both good and bad experience are shared thousands of times an hour.