Reacting negatively to heresy is different than just reacting to ideology that offends our personal beliefs. It seems to me that religion is a personal belief. As humans we react strongly to that which effects the way we personally view the world, especially if other humans claim our personal beliefs are wrong.
We are not to go around and personally offend others just pointing out where they are wrong. We are to proclaim the truth and the Holy Spirit convicts and does the offensive part of the process. If we have the truth, why would a lie offend us?
Normally when it comes to the act of Salvation, some are offended when told they can do nothing on their own to that end. Some are offended at the thought of just being obedient to the Word of God. Obedience can be construed as a work of Salvation. Even having Faith can be confused with working it out on our own terms.
The reason that reincarnation does not make sense is that it promotes humans procuring their own salvation on their own merit. Even evolution can be similiar in concept in that the physical is attempting to find the perfect result God is “looking for”. Except God is not “looking for” human or physical perfection. If we accept Genesis, God created the universe in a perfect way, without any thing else to make it better. However God allowed the knowledge that things can be in a less perfect state. A state that the physical cannot correct and change at all. Only God could correct the physical from any state back to a perfect state.