People who work in security, particularly in computer security, get a bad reputation for paranoia and for always saying no. Some of those reasons are deserved, and some aren't. Security people tend to be more aware than most of the people around them of the potential consequences of omitting some security controls. They also tend to be more aware of how often security problems cause bigger problems like lost money, lost customer information, etc. But, the accusations against security people are also often true. Security people do have a paranoid streak. Sometimes, they get so caught up in what could go wrong that they neglect the advantages if things go right. "This could cost us a million dollars!" is a concern, but if it's something that will make billions of dollars, that might just be okay. To deal with this conflict, most organizations have come to rely on some sort of threat modeling. I've talked about it before, but in a nutshell, you think about way...
An American geek stumbling through Zürich culture.