Holy freakin' crap...

As stated before, if the cops were wrong, send them to Iraq and Afghanistan.

However, as to why it was done this way...

Hmmmm....

Multi-house search (thus, why you wouldn't try to bag one of the guys leaving work and tip off the others);

Not a "no-knock" warrant;

Paraphenalia indicating possible connections to home invasions and trafficking;

Does it suck that the guy was a Marine?

Yeah, it does, as he could very easily have been involved in what the cops were/are saying he was involved in, and thus a disgrace to us all.

We'll find out, soon enough... Though, this thread does point out some prize-winners (most of whom were already known).