Here is the dialog between glover and the elder stars.
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Stephens translation: chapter 395:
Phone: If we read the Poneglyphs,
the Ancient Weapons can be resurrected and the world will be endangered!!
You may not have any malice, but others will, and the result will be the same.
Clover: No matter what the past holds, it is human history, and thus we must bear all of it!!
If we banish our fear and know all, we can plan for any occurrence!
Phone: You're being idealistic.
Clover: Perhaps. Or perhaps it suits YOUR needs to make things thus!!
What we want to know most of all at this point in time,
is not the contents of the Poneglyphs, but their reason for existing.
Why did the people of the past use stone monuments,
to leave some message for the future…
They carved history into unbreakable stone and spread them around the world...
Is it not because their message could be destroyed on mere books and paper?!
Clear proof that the people who left them had ENEMIES!!
Phone: What is your point, Professor Clover...?
Clover: If we assume those people were wiped out by some "enemy,"
it means those enemies should have survived later in history.
Coincidentally enough...
800 years ago, at the end of the Lost 100 Years,
was the precise birth of today's "World Government."
If the enemy of those eradicated peoples is our World Government,
then the "Lost 100 Years"
could easily be a piece of INCONVENIENT HISTORY that the World Government needed to stamp out...!!!
From the ancient writings of the few Poneglyphs we HAVE found,
we have learned of the existence of a nation... One which no longer exists in any form,
but still appears in those messages.
An ENORMOUS KINGDOM...!!
Clover: They seem to have held great power once,
but the information about this kingdom has been carefully erased.
As they knew of their imminent defeat by the alliance
that would later be called the World Government,
they carved the truth into stone, to give to the future.
Those are the Poneglyphs that still exist today...!!!
Phone: I see...
Quite a bold THEORY...
Clover: The Ancient Weapons are truly a threat to the world!!! BUT!!
More importantly, the existence and ideals of this country,
that threaten to be brought to light again are the GREATEST threat to your World Government!!!
I will not know what threat this is until it is revealed,
but the name of this once-mighty kingdom,
which holds all the keys, was--
Phone: Kill him.
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They claim that the ancient weapons must not be revived cause it's a great threat to the world. Fact is, they tried to get one of them…
They do not really fear the ancient weapons. That's the propaganda they spread...
It's more the knowledge glover had about the void century.
He didn't say much but they killed him.
They have that great mighty prison which they are so proud of. There is no reason to kill anyone who researched the void century. They could have rot in a cell deep at level 6.
Just forget for a moment that luffy managed (had the luck) to escape. Back then till luffys break in impel down was safe!
My point is that guys like akainu or onigumo totally fit to the WG. They rule ruthlessly and have no problem putting their justice above the life of so many. Doflamingos speech sums it up.