Why do people still buy foods that contain artificial additives even though they know the dangers of it?

It is for my science project and i would really like to know about what everyone has to say about this. Many people have heard of incidents in countries where certain food additives/preservatives have caused serious illnesses but a lot of people would still buy other snacks from the supermarket even if they know that it may contain artificial flavouring. Why is that? If anyone has any thing they want to add to this topic then please say so. Anyone's opinion would help. thanks!