Good post, dalconn. Many of us belonged to groups which taught against the Trinity. As a part of the Armstrongites, I was anti-Trinitarian.
Most of the aggressiveness against it is related to a poor understanding of what the Trinity teaches. In addition, cults often object to it based on their own false doctrines. For instance, Armstrongites teach that they are going to be Gods in the future, so limiting God's nature to three Persons rubs against their false teachings. They believe that they will be added to the Godhead in the resurrection.
Many times anti-Trinitaries set up a "straw man" version of the Trinity which doesn't fully reflect what orthodox Christianity teaches on the topic, and then proceed to criticize it, in order to bolster their position. The listeners aren't experienced enough to know that what is being represented as the Trinity doctrine isn't even the Trinity doctrine, but is an intentional or ignorant misrepresentation of what Christians believe concerning the Trinity.
Some anti-Trinitarians also seek to diminish the full deity of Jesus Christ, either denying his deity or relegating him to the status of a lower god, like the Jehovah's Witnesses do. This view is called henotheism. Denying the full deity of Jesus Christ is pretty serious. Why was Christ sinless if he was not God, and why did he accept worship? Besides, Colossians 2:9 clearly teaches that in him the fullness of the Godhead dwells in bodily form.
In addition, some professed Christians are anxious to label many things "pagan" because they think the Roman Catholic Church or Constantine enforced them on the Christian church. They don't realize that Constantine was an Arian until later in life, and the council he was involved with organizing insisted on the biblical truth of the Trinity. It's a variation on the conspiracy theory mentality of many professed Christians, especially within the cults. A distorted view of church history is commonly employed by these groups with unorthodox doctrine.
I'd challenge anti-Trinitarians to read Forgotten Trinity, by James White, along with the Bible verses it lists, to fully understand what Christianity teaches on this issue. His book is excellent in this regard.
By the way I am not stating that an anti-Trinitarian is necessarily a false believer, as I was an anti-Trinitarian for a decade while saved. I think rebelling against the teaching without fully examining both sides definitely indicates a lack of wisdom and may indicate a contentious nature. While the church may not be right on everything, I would think twice about rejecting church history in this regard.
I think this is one topic, though, that cultists use to separate themselves from others and claim superiority or an exclusive relationship with God. Others use other things..tongues, Sabbath and Holy Days, etcetera. The attitude is that "we know the Truth and you do not. Accept our theology or be lost or less spiritual than us."
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