Actually, from what I've seen I'd say that the Neutral security forces are perfectly capable of dealing with small-scale threats to the public peace without outside intervention. However, the key there is small-scale.

And while it is true that Omni-Tek does benefit financially from the neutral status granted to Borealis, Harry's and 20k, it is also true that Omni-Tek has a vested interest in establishing an independent government which understands and respects Omni-Tek's corporate interests on Rubi-Ka.

After all, the ICC lease isn't going to last for ever.