This is https://en.wikipedia.org/wiki/Argument_from_ignorance and is also asking someone else to prove nonexistence of a situation. Both of these are inappropriate in a good faith discussion and I believe it would benefit you to consider how you reason about these situations if you want to come to well founded conclusions.
If you have evidence, or even plausible speculation as to the government "disappearing people" you should present it here so we can all understand and respond to this, as it is extremely important. If you are just assuming that the government 'must be' disappearing people, without any evidence or even a plausible theory which you can share then you are just being hysterical.