I don’t allow my children to carry for others on Shabbos, even though I allow them to use the eruv.
Don’t ask me to open a bottle of soda for you on Shabbos, even though I would do it for myself. I’m not your Shabbos goy.
But,
Haifagirl: If you don’t want to look up things up online for your friend, because she believes the internet is treif, send her to me. I’ll gladly do it for her. Kol Hakovod to anyone who doesn’t use the internet at all.
If someone is afraid to go into a certain store because of the kind of people who work there, and they know someone who goes in all the time, there would be nothing wrong with her asking that person to buy something for her since he goes there all the time anyway.
Avraham Schwartzbaum writes in The Bamboo Cradle that he asked a rabbi if it’s ok to keep a kosher home, but outside the home not keep kosher. The Rabbi answered, what he answers to people who ask this question, is that their dishes will go to heaven. If I use the net at work and not at home, because the net in my office is in an open place as opposed to my home, is that the same thing? Common sense should tell you, it is not.
Let’s not compare apples and oranges.