There’s a practical reason to know what the proper care is, and follow it. Even if there is a lifetime warranty, no questions asked, you still have to go through the process of getting the socks replaced if they become damaged. It’s better to just not ruin them in the first place. So it’s still good to know how to properly take care of them.
This is something I remind my customers of all the time at work. We have warranties on all of our computers, but you can’t snap your fingers and voila, they are magically fine again. We have to carefully document the issue, submit the request, schedule a repair, be on site for the repair, and so on. And in the meantime, your computer is broken. So be careful for fucks’ sake.
As for the ethics of disregarding care instructions… Warranties aren’t free. They are part of the price of the product. It’s one of the selling features. I was a salesperson once upon a time, and our 3 year warranty was intended to give the customer the peace of mind that if something went wrong, we’d fix it (as long as they didn’t do anything to violate the warranty that is).
For socks, the warranty is there to assure you that if you don’t want to be gentle with the socks, it’s fine. They’ll take care of it when the socks get worn out. They do that so you buy the socks from them, and not a competitor who might sell socks that are effectively identical but without the warranty.
It’s like the ethics of a free refill in a fast food restaurant. It’s not unethical to get a refill. If you feel like you are taking advantage of the business by doing so, and don’t feel right about it, that’s fine. That’s your prerogative. Don’t get a refill. It doesn’t mean it’s unethical for other people to take advantage of the offer, but if it makes you feel better to not do it, don’t do it.
On Sunday, I took my friend to one of our favorite game stores. (He had a stroke a number of years ago and while he has recovered well he can’t drive anymore, and doesn’t get out of the house as much as he’d like, so I took him on a bit of a trip.) When we got there, we found out that the store was closing and they had a huge sale on much of their merchandise. I felt a bit bad taking advantage, because they are obviously having financial hardships (or they wouldn’t be closing), but they are offering that discount for a reason. They are trying to get rid of stock as fast as possible before they lose the store to sell them from. Considering that, my guilt went away.
Another example… When I go to the grocery store, I go out of my way to return the cart to the vestibule after I go shopping. I used to work in a store, and I used to be the person who had to return carts, so I know how much that can suck. When I return a cart, it feels like I’m helping out my past teenaged self who had to do that stuff. I know that ethically I don’t have to, there is no obligation to do so, and someone else is paid to do that. And my returning one cart isn’t going to matter much to the person who has to go out and collect dozens at a time. But it makes me feel better to do it. I’m doing it for myself, really.
I don’t judge everyone else who doesn’t return carts and I don’t think they are being unethical for not doing what I do.