

It's also an observable truth that good substance can take the ride with horrible insults in the same post...
It's also true that if you had to choose ONE and only ONE of these attributes to put in a posts one would be wise to choose substance...
However many people here seem to think that manners don't matter at all when you have the right answer--they can beat somebody over the head until the other side cries surrender, or else.
Then they seem to be surprised when the other side does not yield, but instead starts insulting them right back, saying they must not have a good argument if they have to resort to this sort of thing, etc.
The last sentence as it stands is false, of course, but a variant of it holds true: you don't NEED to resort to this sort of thing if truth is on your side. In fact I would think it is common knowledge that when you get the person debating with you all riled up, he will no longer see reason.
Also, although it has been demonstrated that manners and substance need to go with each other, nor take leave at the same time, people nevertheless often associate them together, and with good reason--good debaters TEND not to resort to insults, bad debaters tend to have bad style too.
Why undermine the utility of the substance in your posts with bad style?
edit 1: grammar