For V1-Ooops - It is not the Khat that is being criticised. Generally it is the issues that surround it that cause it to have such a poor reputation.
There is nothing wrong with khat as such. BUT flying it from Kenya these days involves absolutely obscene levels of overloading, aircraft abuse and many other related "issues" that any self respecting operation would want to avoid.
In the case of this F27 crash; the pilot had no alternate - because had he landed even 50km away, at worst he may be shot, and at the very best all the khat would have been stolen, the company 540 would not have been paid by the owner (a Nairobi based Miraa baron) who would also demand compensation for the lost khat. Keep in mind these guys and their henchmen walk around Nairobi with AK-47's. Landing on the wrong strip is unthinkable.
The F27 is said to have made 6 attempts to get underneath and on one previous attempt nearly crashed on the destination runway.They were flying 50-100ft AGL in IMC...........
As I said, no one minds the khat, its the stuff that goes with it most people don't like.
P.S. LOOONG ago when things were different even Air Kenya used to fly khat.