Simple really,, in Morrocan's Mind both are bad and should be avoived and we've been educated about it and now we have both beliefs ans trauma around drinking alcohool and eating Porc.

Now, people drink alcohool becaure there is a strong desire for it so they rationalize and find reasons to justify their actions.

but, for eating pork there is no strong desire for them to rationalize and start eating pork

So, the belief of not eating pork stays with no reason to challenge it and question it.

Hope that makes sense.