Latter-day Saints don't discuss some aspects of the temple outside of its holy walls. It's not because these aspects are secret, but because the teachings of the temple are sacred to us. Enemies of the Church often take advantage of us because they know we are somewhat limited in what we can say about the temple. However, while I won't discuss the details of our temple teachings, I can make a few appropriate comments that should address this issue. The question itself demonstrates a lack of knowledge concerning the use of symbolism itself.
Symbols have no power in and of themselves for either good or evil.
The power of a symbol comes from what it represents to the user. This means there is no such thing as a good symbol or a bad symbol. The goodness or badness comes from what the symbol represents to the user and how it influences his or her thoughts and actions. All symbols used by Latter-day Saints are used to help us center our faith in Jesus Christ. If other groups use the same symbols for other purposes, their practices do not change or nullify why we use the symbols that we do.