Answer:
Arguments need evidence because evidence is the concrete fact to support your claim without it your argument is just an opinion and nobody will take it serious if it is not supported with evidence then your audience will not support your claim.
Explanation:
You'll have to be somewhat more specific with regards to what form of transformation you refer to. Shaper shifter, red riding hood and the wolf, multiple personality disorders, serial killer etc... The one common thread in this context is that appearances are always deceiving so it is always wise to be on your guard in any given situation because absolute safety is an illusion.
