Whether it's bad to not welcome uninvited guests to your party depends on the context and your perspective. Here are some considerations to keep in mind:
Privacy and Respect: It is entirely reasonable to want to maintain privacy and control over who attends your party. If you've planned a private event and someone shows up uninvited, it can be seen as disrespectful to your boundaries.
Safety Concerns: Allowing uninvited guests into your party may raise safety concerns, especially if you don't know them. It's essential to prioritize the safety and well-being of your guests.
Limited Resources: Parties often involve planning, preparation, and resources (e.g., food, drinks, space). Inviting more people than you've planned for may stretch your resources thin.
Social Dynamics: Uninvited guests may disrupt the social dynamics of the event. If the party has a specific theme or purpose, having uninvited guests could alter the atmosphere.
Diplomacy and Tact: The way you handle uninvited guests can affect your social relationships. If you decide not to welcome them, it's essential to do so politely and respectfully.
Exceptions: There may be cases where you're flexible about having uninvited guests, such as close friends dropping by or unexpected visitors with a genuine reason for attending.
Ultimately, it's up to the host to decide how to handle uninvited guests. You may choose to turn them away politely, accommodate them if it's possible and safe, or assess the situation and make a judgment call. Communication and tact are essential in handling such situations, as being rude or confrontational can escalate tensions. It's always a good idea to set clear boundaries in your invitations or communicate them if there's a change in plans.