Linoleic acid is an omega-6 fatty acid, and is essential to the human diet. So you have to have some, but you don’t want much, and for two reasons: (1) in quantity, it causes inflammation, and (2) it competes with omega-3, the other essetial fatty acid, for absorption (they use the same pathway). So not only do you want the right proportion of omega-3 to omega-6, you don’t want too much omega-6 to begin with.
If you eat any processed food at all, then you have no need to worry about getting enough linoleic acid.