This pretty credible source substantiates the reports on the Harvard/MIT and other studies that show a strong correlation between homophobia and suppressed homosexual feelings.
As Freud found, and with it launched the discipline of psychology... it is the intense suppression of true feelings that causes harmfully abnormal stress and behavior; not the feelings themselves.
The whole process of growing up and "becoming civilized" is the process of learning to suppress true feelings when they are harmful to others. This is the mandatory requirement in order to have any kind of functional society.
However, looking deeper tells us that (like everything) there are limits.
Too much suppression, too intensely, for too long creates a fragile psyche that can collapse into harmful behavior when stressed.