bniu wrotehome team's responsible for the conduct of fans in their ballpark (unless we're in the odd situation where the host team are designated visitors for that particular game).
While that may be true, my point is that just as easily as one could say the home team benefited from the interference of a home fan, one could also make the case that the home team got the benefit of the doubt when a fan from the visiting team thought it'd be smart to touch the ball making it dead and have the umpires hold the runner at third.
Hence why taking into account which team's fan interfered isn't a good idea.