History says that your belief is well founded, as it is overrun with as many cases of that simple truth as there are cases of tyranny in the past - and present.
What's troubling though is that people are forever placing their faith and truth in elected & appointed others.
They are highly reluctant to trust their young children to be alone with anyone they don't directly know (which is good), but by that same token, they are completely willing to trust the leadership of their towns, provinces, counties & countries to complete unknowns.
The sociopaths in and out of government have it in mind to rule. They may mean to rule well, but they mean to rule nonetheless.
It is the understood paradigm of government which allows that to happen repeatedly, and with great regularity.
It happens because people trust the ones who should not ever be trusted, and those people should never be allowed to exercise any power at all, without the very largest majority of the people giving their consent for a specific reason, and for a very limited time.
And always, the whole body of the people should be armed with every device which they have seen fit allow their armies to possess. Actually, if every nation were to follow Switzerland's lead, there would be no need for an army, because that whole country IS the army!