Predawn Search Warrants. Fun for Some. But Are They Necessary?

Late last month, FBI agents served a search warrant at the home of former Donald Trump campaign chairman Paul Manafort.  Which is fine.  If they think Mr. Manafort has evidence of something untoward, a search warrant is what you do.  What I don’t understand is why they felt the need to serve the search warrant before dawn.

This seems to be a not unusual time to serve search warrants.  Back when Democrats were investigating whatever they could about Scott Walker's campaigns, they would serve search warrants before dawn.¹  You sort of wonder whether some of those issuing such search warrants enjoy the idea of having people with guns knock on doors before dawn, while people are still asleep, to scare the heck out of the people upon whom the search warrant is being served.  (Especially if they think the people being served are engaged in some kind of evil activity.)  But do the ends of justice really require that it be done before dawn? 

I understand that there are cases where surprise is needed, both to get the material being searched for and for the safety of those serving the warrant.  If there is a concern that the people upon whom the warrant is being served have guns and will use them, surprise is appropriate.  Also, it’s fine if there is a concern that evidence will be destroyed.  But is the fact that predawn raids are necessary sometimes, mean that they should be used so much of the time?  Or are they used for the sake of drama and PR, not unlike the “perp walks,” when prosecutors alert the news media to arrests of white collar criminals, so the evening news can show film clips of people, with their hands handcuffed behind their backs, being led away by the police.

As I said, while the pre-dawn service search warrants is sometimes necessary, I wonder, in most cases, what part of justice requires it?
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¹ The Scott Walker investigations are especially interesting.  The investigations were ultimately stopped by the Wisconsin Supreme Court because there was no legal basis for them.  But before that, they were conducted under a special Wisconsin law that didn’t let the people under investigation even talk about being investigated.  Which meant the cops could, and did, conduct pre-dawn raids of your house and you couldn’t tell your neighbors what it was about.  A nice little police state touch there.  And you thought, at least before last November, that Wisconsin was a progressive state.  Inter alia, see here, here, and here