I disagree. Now technology is better, It depends on the people who uses technology if they want to use it for negative ways than positive stuffs. Therefore we cannot say that people use technology for negative things because it depends on other people's attitude.

However, Mankind has created different things to kill mankind, for example, terrorists can now activate bombs by using cellphone

Yes i agree. Although mankind have made things that can kill us through technology, technology also help us various ways such as: Food,Drinks,Entertainment.