His explanation for why he posted what he posted was fair. Whether he should have deleted it after or not is a fair conversation to have as well.
His point regarding Nat Turner's rebellion is a fair one as well as his response to Pier's question regarding what his parents would think of what he posted. Its an uncomfortable discussion point for people because it puts them in a moral quandary. Nat Turner's rebellion killed loads of innocent people including women and children, yet to a large number of people he is seen as a hero and an example of resistance. If Jews within the concentration camps had been given the opportunity to break out of their camps and take revenge on the Nazi soldiers and their families, there is a high likelihood that they would have.
If say for example in 50 years time Gaza and the West bank are unified as 1 Palestine, the people there have been restored their rights and they are able to live their lives to the fullest, how would actions like October 7th be seen to those future Palestinian people? There would be a good chance that Oct 7th would be viewed to them as Nat Turner's rebellion is viewed now. Alternatively, if there is no Palestine in 50 years Oct 7th would be viewed as one of the greatest terror attacks ever because at that stage history will be written by Israel.
Now that is not to endorse Oct 7th or what Israel is doing, however it highlights the silliness of the stance of people like Piers. Piers knows full well that if he was born in Gaza, living under those conditions, treated like animals then most likely he would have been one of those breaking through into Israel.