While the winter holidays bring out the best in most people, they bring out the worst in some others. When people are at their worst, that's when police are called in to straighten it all out. Most of the time successfully, but sometimes not.
Those in patrol know that domestics and disturbances tend to rise during holiday season, when emotions running higher than normal, often result in violence. SWAT also knows the holidays are when callups tend to increase in both frequency and intensity.
In patrol, you literally hold your breath, hoping you'll make it through your shift without someone assaulting, stabbing, shooting or otherwise harming others - because emotions are running high. If you get through your shift unscathed, you consider yourself fortunate and so does your family.
In addition to patrol, there are other assignments - detectives, dispatchers, corrections, etc. that are required to work the holidays in our 365 day a year profession. For a fortunate few, holidays might fall on their day off. But for most, that's not the case.
Same with SWAT officers, who even when they are off duty, are still on call-24/7. SWAT officers know and accept this, and so do their families. It always seemed to me that we saw a spike in SWAT callouts during the holiday season, from mid November through mid January.