Brother Qari Shams, the best antidote for any and all evil is the Dhikr of Allah

. Guarding one's salah at the proper times, reciting Quran, doing one's best to understand and implement Quran & Hadith/Sunnah into their life & educating their loved ones about the same, and (for males mainly) making sincere effort to stay involved in the Masjid on a daily basis

.
Violence is not needed, as Allah

is just and He will deal with the ones committing such evil acts, if they really are doing so.
Another thing is, that one may be able to 'stop' such a person from doing evil via means of physical violence, but in the end we still need Allah

to cleanse us of any evil which may be on and around us and to purify us.
Of course, that is all my personal opinion.
May Allah

forgive us all and keep us under His protection, may he cleanse your friend and his family of any evil which is near them and protect them all, Ameen.
Allah knows best.
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