Thanks for clarifying FL that you do in fact still visit the Ngong Road Forest, and I'm very sorry to hear about your syce's experience, which must have been terrifying, and I guess I'm surprised you've been back at all after that.
I'm sorry also to hear about your friend at Lavington Green. Surely the car park is gated there, isn't it?
FL, I don't think you and I are going to reach a consensus about these two forests (incidentally, I don't see how Ngong Road Forest and Oloolua Forest can both be on your doorstep since the entrance gates are 8km apart - you have been to Oloolua?), but I think it's helpful for TA users to see the spread of opinion. You're in the security business, which depends on a certain level of perceived risks to survive, and I'm in travel, which depends on people putting those risks to one side, so it's fair to say we are both probably biased to some degree. As for questioning the knowledge of posters on TA, I think you should expect to be challenged if you use social media - I certainly expect it, and I think it's a good thing.
Anyway, I'll drop an email to Simon at the Ngong Road Forest and see if I can get any mores instances of attacks from him - going accompanied with one of their rangers is obviously a good idea, but if it's as insecure as you say, then the various family fun runs, bike rides etc that they hold there would be a bit odd…