So apply this logic to the rebels - why did they threaten investigators, why have they mined the area?
FIRST RULE in a war -- if one side says the other side is doing something, it is 90% untrue and 100% propaganda. What evidence is there of mines? Kiev put that about to keep investigators away because the were planing/doing an ATTACK on the separatists.
The separatists were understandable leery about these foreigners, who originally (the OSCE people) there as
political observers but get around in convoys like they're important and wear flak jackets like they're scared. They truly might be spies. Especially when their leader (Bociurkiw) speaks fluent Ukrainian. Less to do with MH17 and more with their general situation. News crews getting around in local battered old cars got let in everywhere.
To prevent the rebels from tampering with the evidence.
Nope, it was no-man's land, next in line to be taken back anyway. What tampering would they suspect? They made no attempt to take back the area until the train with the bodies had left (and the observers, too). The "rebels" had a week to "tamper" and all they did instead was pick up the bodies, and a lot of belongings, and hand them over to the right people, ie ones who were not going to tamper.
I think too for the propaganda/credibility factor - controlling the area allows the rebels to deal with the international community as an entity in their own right -Denying the rebels this opportunity is a thing Kiev certainly wants to do.
What is it today? July 18??? are we in a time warp?
a) the separatists DID have physical control of the area before and on July 17
b) OSCE and anyone else DID have to deal with them
c) they did let in the Emergency Services people to help pick up bodies, these were probably fairly local people but the service is under Kiev control
d) they then took the bodies away from them (at gunpoint but they didn't sound like they wanted to resist much anyway) to maintain control over what happens to them next (you can understand they don't want them ending up with Government, who
might tamper to put more blame on the separatists).
e) The Netherlands and Malaysia DID NEGOTIATE with the separatist leadership about the return of the bodies and black boxes. Successfully.
Kiev did not try to take back the territory until several days after the mortuary train left Torez --
actually 10 days after the crash. They did, however, keep OSCE observers out by claiming the separatists had mined the area.
So preventing the separatists from dealing with the world in their own right??? 10 days too late for that.