This was a wonderful teachable moment about actions having consequences. Parenting is not always easy and it is not an exact science and lots of people disagree about how to handle situations. By letting your grandchild know in a calm way that this was unacceptable behavior and how he had to correct it he will be learning a good lesson from you about love and limits and respect for people and property. And although some family members did not agree with you they might look back and thank you later in life. Hopefully the child did not hear the disagreements between you and the other family members about how this situation was handled as this might be confusing to him. In the end the child may not have liked the consequences but in my opinion it was a valuable lesson to learn. I'm wondering how the parents would have handled it?