It is a principle of democracy and decentralization.
That has nothing in common with democracy and decentralization ... I think that you are using big words to spread FUD. Where you have centralization here?
This feature is made not as a tool to attack others/to restrict rights. It is made to make sybil attacks as hard as it is possible.
The Idena protocol introduces incentives to prevent participants from buying and selling invitations. The person who sells an invitation can kill the invited participant during the next three epochs. The seller can double-spend the invitation by selling it multiple times. Invitations should be granted for free to trusted people only (relatives, friends, and so on).
And all i can do as an inviter is to kill max 2 epoch old account which is worthless (despite few stake coins that will be burned ~5-10$ loss for this poor guy) what will give me 0 profit. What's the point of doing that?
So much FUD, big words and this will harm 1 person out of 1000 only because he took invitation from stupid bustard (and it is not recommended to use/give invitation to random).
I think that you are Troll/paid FUD maker. I suggest everyone to simply ignore him. Maybe he will go away.