I'm not flaming you but while there are guidelines about those foods during pregnancy, there is not any risk from eating soft cheese and undercooked meat during breastfeeding. The risk of those during pregnancy is catching listeria. You can't pass listeria on through your milk and stomach cramps won't affect a baby who is already born.
It's not going to massive lengths, it's just looking critically at things and wanting to understand why so that you don't end up generalising something which doesn't make sense to generalise.
I agree with you about the fun being getting drunk so I don't really drink often anyway, but most people don't see it like that. (Then again, I drink so rarely a couple of glasses can get me totally pissed so there is that :o) Lots of people will have a drink or two just for the effects of that drink or two. And they shouldn't feel as though they have to abstain when there's no indication that they need to. I even heard a mum friend complain that she couldn't have coffee while breastfeeding! And she has twins! Dear lord does anyone deserve coffee more?? I'd like to smash all of these myths about breastfeeding which make people think that it's a hassle or a special thing which one needs to be totally dedicated to.
There are some substances which go into breastmilk and should be avoided/used with caution - some medications for example, THC (weed, often thought of as "harmless" but not when BF), even dairy protein - most people don't need to be careful of that one but if you have a baby who is sensitive, that can genuinely upset them.
Breastmilk is basically fat and blood without the red blood cells. Anything in the blood is going to transfer in tiny quantities, it's substances which are fat-soluble which go through in massive quantities. It's made as needed so if you feel tipsy then the alcohol is in your blood which means it's in your milk, but again, minute quantities, as we'd find in fruit and process quite easily.