Jihad is NOT terrorism, it's a way to liberate the oppressed Muslims in all over the world, and to liberate human beings
from subservience other human beings and bring them to obedience to the One True God (Allah)
Jihad dose NOT contradict the concept of mercy. It's obligated to liberate people from worshipping other people to worship Allah alone.
To liberate people from tyrants and tyranny.
To fight oppression and oppressors.
To spread the message of Islam, so we can help people finding peace in life [Dunya] and Janna [ paradise] in the hereafter [ Akhera].
Thus, Jihad goals do NOT contradict the concept of mercy, but rather they enhance and support it.