"These collisions are not an accident. These are deliberate acts of terrorism to disable our military presence."  -- Proof, please?
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"Persons aboard all of the ships slamming in to our military vessel are responsible for these acts."
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If two vessels collide at sea, the nautical rules of the road state they are BOTH at fault-- the percentage of that fault will be weighted differently, but the takeaway is that it is not the case that one vessel is at fault and one is not.  If it wasn't the DDG's fault, then 7th Fleet would not have been fired.
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"Could you think of a better way to get your weapons or contraband through an area,"  -- yes, don't hit a Navy Destroyer.
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"or test naval strategy and movement?"  -- the collision took place in a traffic separation scheme: the vessel's "movement" is pre-set by maritime law, as are all vessels sailing through that area: they have literally remained unchanged for the last 60 years.