Couples who disagree on something often share their feelings with others, but involving friends and family in a marital disagreement can lead to more issues down the road. They might benefit from the immediate support, but the trouble can come once they have found their own stability on the issue. Those who love them outside the marriage might feel they should leave their spouse and take the children with them. Failure to immediately follow that suggestion could mean they will lose respect, and it could also lead to social services investigating the couple for the safety of their children.
Divisive issues can be surface ones having to do with supporting a sports team, but many of them are much more important. They can be about things that have to do with how to raise the children, discipline within the household, or they might even be about spousal abuse. These are not issues anyone would take lightly, so the possibility of bringing outsiders into the relationship when telling others is a reality.
Not all arguments between couples lead to something being done, and many of them are theoretical in nature. The couple might simply find they do not agree on something they believe is important, but it might not actually affect them at any time. A spouse who tells their partner they believe beating children for bad behavior with an object might cause issues in a discussion, but it would not necessarily be something that would ever come to pass even if a child misbehaved.
Those who find their partner does not agree with them on an issue should take the time to consider their options before involving outsiders, and they should weigh all the possible outcomes. Going back over the issue with a partner might clarify it, and they could find that their disagreement is more theoretical than real.