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Needs must when the devil drives

Greek term (edited): �������� ������ ���������

πάσσαλος πασσάλω εκκρούεται = (ο πάσσαλος με πάσσαλο βγαίνει) = το κακόαντιμετωπίζεται με το κακό, το γαϊδούρι θέλει ενάμισι γαϊδούρι

Χάνεις τον καιρό σου αντιμετωπίζοντάς τον με το καλό.Πάσσαλοςπασσάλω εκκρούεται.
http://sfr.ee.teiath.gr/htmSELIDES/Technology/Orogramma/doti...

Αν και δεν είναι ό,τι καλύτερο, θάλεγα για αρχή:

(Doing) evil brings evil
It's no use doing him good
Evil treats evil



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Note added at 16 mins (2005-03-16 10:23:42 GMT)
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Ή και \"evil against evil\" αντίστοιχα αλλά αντίθετα προς το \"Good Against Evil\".

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Suggestions:
oppose force with force

force must be met with force

Lots of Google refs

"sometimes it is lawful to oppose force with force"

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Note added at 2 hrs 3 mins (2005-03-16 12:10:29 GMT)
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I only had time for a quick look at your example, but thought something on these lines might be appropriate here.

Instead of meeting force with force, we use strategies to unite opposing forces.
One way is to join them together into a spiral motion. ...
www.heartaikido.com/faq.html

The phrase \"meeting force with force\" comes up in contexts from politics to martial arts, as you\'ll see if you search for phrases like \"policy of meeting force with force\" etc.

Greek term (edited): �������� ������ �������� / �������� ������� ���������

fight fire with fire, use fire to fight fire, it takes fire to fight fire

http://spam.gunters.org/archive/2003/12/01/an-anti-spam-mani...
Perhaps it is time to use similar tools to what they use in order to break their business model. Use fire to fight fire.

http://www.twbookmark.com/books/29/044661503X/chapter_excerp...
You might say a vaccine uses fire to fight fire: A little bit of the pathogen is specially prepared and usually injected into the body so it can help fight off any "wild," or naturally acquired, versions of the disease.

http://eyeonit.itmanagersjournal.com/article.pl?sid=05/01/14...
Services firm decides to fight fire with fire

http://www.danielpipes.org/comments/18097
You can't fight fire with fire…
…violence does not solve violence.

or “one nail drives out another”, “nail drives out nail”:

http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/L...
…which drove out one commander with another as nail drives out nail.

http://www.fullbooks.com/Pamela-Vol-II-5.html
"No, but it was necessary that one
nail should drive out another; for thou'dst been repining still, had
not Mr. Murray been _turned over_ to thee.”