1) Lives will be lost not only in the country they are attacking but also within the Peacekeepers. From http://www.foreignaffairs.com/articles/55875/max-boot/paving-the-road-to-hell-the-failure-of-u-n-peacekeeping :

The United Nations itself has recently released reports documenting two of its worst stumbles. According to these confessions, U.N. peacekeepers in Rwanda stood by as Hutu slaughtered some 800,000 Tutsi. In Bosnia, the U.N. declared safe areas for Muslims but did nothing to secure them, letting the Serbs slaughter thousands in Srebrenica. The organization's meddling was worse than useless: its blue-helmeted troops were used as hostages by the Serbs to deter a military response from the West.

2) The current solution is not working. The UN does not have a good reputation as it is, and it is not worth the risk to further besmirch their name

3) Some UN officials are against offensive operations. This tells us that even though they are going on and doing it, it is not unanimous and should be considered more by the UN before going into effect.

4) It undermines one of the three basic principles of the UN, this principle being "Non-use of force except in self-defence and defence of the mandate"

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