An outsider might tolerate a nagging issue because his attention is scattered among various projects. In-house security can stop these situations from spiraling out of control by triaging troubles at first sighting. An outsourcer’s methodology is based on previously seen problems, but this approach fails when faced with problems that rapidly expand in scope and complexity. If security is a business-critical function within the company, it should be internally managed. Hiring an extra set of hands or feet is fine, but the brain, eyes and ears should stay attached to the body.”]
Source: https://www.csoonline.com/article/2116560/security-outsourcing–creeping-determinism.html