Church doctrinal statements and general books on theology only dedicate a small section and a few Bible passages to this subject. Many accept this belief because they do not examine the subject further. Most conservative Christians believe a lot of Scripture supports everlasting torment. This is not the case. Passages that appear to support this belief only seem common because they get overemphasized.
Several authors write books supporting everlasting torment.
Interestingly enough, these books only quote a few Scriptures. They give pages and pages of commentary on only these few verses in many cases. There are also many other writers who support their view, so they reference each other more than the Bible. On the other hand, conditionalists can quote pages and pages of Scriptures to support this view. Many of these passages are clear and there is little need for further explanation.