The current lack of misuse doesn't make it clear that it will not be misused in the future.
And there's a saying about that kind of statement, argument from ignorance. To predict that future events/intent will occur based on a lack of evidence for said events/intent is a fallacy.
When the balance of power is tipped so far, tyranny will just be that much more enticing. Do I think our current administration is trying to become a monarch? No. I like to think that the playing field, for the legal average citizen should be level and remain so.
Which ignores the earlier point, if tyranny were the goal or people were so enticed by objects, does it really matter what branch of the federal government has the objects? The federal government already possesses...tanks, bombers, fighters, armed UAVs, self-propelled howitzers etc, etc etc. You speak of the level playing field as if it weren't for DHS having a handful of X and Y, we'd be on equal footing. What you're basically asking for is a complete disarmament of the military in order to ensure people aren't enticed by inanimate objects.
Given that we do not live in a fictional one state, one faction world, one of the double edged portions of the social contract is that the government will have some objects which can potentially be misused which are restricted from general public possession. (Although in the case of a decommissioned self-propelled howitzer or similar armored vehicle you too could have one if you had the cash)
Theoretically, do I believe that people should have access to the same things as the government? Yes. However, in reality, and therefor practically speaking, this is not the case. To fear the same objects that one branch of the government has just because they were given to another, is illogical when premised on some potential tyrannical misuse.