Someone might make mistakes or have limited knowledge, but they are not intentionally hurtful.
It's often used to:
* Deflect criticism: Someone might say this when they feel they are being judged for their lack of knowledge or intelligence.
* Acknowledge a mistake: Someone might use this phrase after they've done something foolish or made a mistake, but want to assure others that they meant no harm.
* Express kindness: This phrase can be used to show that someone is willing to forgive others' mistakes and to extend empathy, even if they disagree with them.
In essence, the phrase conveys a desire to be kind and understanding, even in situations where someone might be seen as lacking in intelligence.