I feel guilty being agressive and winning money

Ok not that guilty. But when at a passive table at Poker Stars with guys that have pictures of their dogs and kids in it, I feel guilty raising all the time and winning their money. They usually do a minimum buy-in for a table and end up broke in 5 minutes. I also start to think they start to leave the table coz of me.

I know I can cure this problem, still... it exists.

Ok here's another question, because I don't want to open another topic. When someone describes they use like
42/19/44. Wot does it mean? 42% vpip, 19pfr over 44 hands? Is that it? And sometimes they ise 55/9 is this 55%vpip and 9%pfr?

And another question, can I get rake back from Pokerstars?

-ty