Oh, my word... I can see the pluses and minuses of this. As a woman, I have thought about the security a taser would provide, but I've always ruled it out because with my luck, it would be taken away from me, or I'd end up hurting myself! So having one disguised like an iPhone could possibly mitigate any risk of one being taken away from me.
On the other hand, it's really dangerous that these are on the market and accessible to anyone, including bad guys, who can use them. as the article states, for nefarious reasons. I wonder what Apple thinks about this.