In The Name of Allah, The Most Merciful, The Bestower of Mercy.

The Messenger, peace and blessings of Allah be upon him, said, “A liar is not one who tries to bring reconciliation amongst people and speaks good (in order to avert dispute), or he conveys good”. [Sahih Muslim 2605]

Imam Abdul Azeez Bin Baaz, may Allah have mercy upon him, said:

فهذا يدل على أن المصلح بين الناس ليس بكذاب، الذي يصلح بين الناس: بين القبيلتين، أو بين الأسرتين، أو بين شخصين تنازعا فأصلح بينهما وكذب فإن هذا لا يضره؛ لأنه أراد الإصلاح فإذا أتى إحدى القبيلتين أو إحدى الأسرتين أو أحد الشخصين فقال له قولًا طيبًا عن صاحبه، وأنه يرغب في الصلح، وأنه يثني عليك، وأنه يحب مصالحتك، ثم جاء الآخر وقال له كلامًا طيبًا حتى أصلح بينهما فهذا طيب؛ لأنه لا يضر أحدًا بذلك، ينفع المتنازعين، ولا يضر أحدًا

This shows that the one facilitates reconciliation between the people is not a liar. The one who reconciles between two tribes, two families, or two disputing individuals and lies, this does not harm because he wants rectification. If this mediator speaks favourably about one party, expressing a desire for reconciliation and highlighting the positive attributes of the other, it serves a beneficial purpose. Such actions do not harm anyone; rather, they assist those in conflict and promote resolution. [1]

Al-Allaamah Salih Al-Fawzan, may Allah preserve him, said:

A person should not leave the people in dispute; rather it is incumbent upon him to be eager to bring about conciliation between disputing parties, especially relatives. As for some people-and Allaah’s Protection is sought-they only bring into disputes that which will increase it. This type of person is a shaytaan. Also the one who seeks to bring about conciliation between the people should do that with justice; he should not oppress any of them or judge based on desires”. [2]

As for the tale-carries, they lie to destroy relationships. Read:

https://salaficentre.com/wp-content/uploads/2021/08/Jihaad_Against_The_Tongue.pdf

[1]https://binbaz.org.sa/fatwas/13189/%D8%B4%D8%B1%D8%AD-%D8%AD%D8%AF%D9%8A%D8%AB-%D8%A7%D9%84%D8%A7%D9%85%D9%88%D8%B1-%D8%A7%D9%84%D8%AA%D9%8A-%D8%B1%D8%AE%D8%B5-%D8%A7%D9%84%D9%83%D8%B0%D8%A8-%D9%81%D9%8A%D9%87%D8%A7#:~:text=%D8%A7%D9%84%D8%AC%D9%88%D8%A7%D8%A8%3A,%D9%84%D8%B2%D9%88%D8%AC%D9%87%D8%A7%22%20%D8%B1%D9%88%D8%A7%D9%87%20%D9%85%D8%B3%D9%84%D9%85%20%D8%A8%D9%87%D8%B0%D9%87%20%D8%A7%D9%84%D8%B2%D9%8A%D8%A7%D8%AF%D8%A9

[2] An Excerpt from ‘Al-Minhatur Rabbaaniyyah Fee Sharh Al-Arba’een. 213-217.