Thatbags I agree with you, deleting a post because someone doesn't like it and reports it isn't really moderating. To moderate, you need to read not only the post that has been reported but the whole context around it, including the tension that may exist between the sender of the reported post and the person reporting it. Much like arbitrating a set-to between two if your children, in fact.
THEN you might:-
a) Delete the post and throw the poster out with a flea in their ear.
b) Delete the post and tell the poster why.
c) Send the poster a message reminding them of the guidelines and pointing out how they came near to breaking them.
d) Sent the complainer a message reminding THEM of the guidelines and pointing out that the post they reported does not break them.
This all takes time. It also goes against the statement that this is NOT a moderated forum.