I would approach this from a lawyer's perspective:
There's a precedent where an war of aggression against a former CSSR country by the NATO was unresponded by Russia. Kosovo anyone? Ye...
I look at this in a similar fashion. As long as the UN has those oligarchic, Stalinist influence named Putin, it'll be a farce. Same counts for Chinese interests.
So NATO should make it their duty to intervene infraction of civil rights in a land at the border to a member(Turkey) thus threatening Turkey's border regions safety. Also there were already missiles landing in Turkey which can be counted as an attack on that country and are a valid reason to defend that country in the limits of the NATO statutes.
It's of course a gamble, but
1) Israel is no member of the NATO, thus it's not responsible for this attack.(This won't mean it won't experience the backlash of Terrorist organisations. But such actions seldom find support with the sane population)
2) Under NATO statutes there's valid reason to intervene.
3) Negotiations have all failed in former cases when discussed at the UN security board(Iraq?).
4) This is a good example to remind other countries how things should run when civil rights are infracted, potentially lowering the willingness for others to act the same.