Theory 1: The red lights are possibly the bathyspheres of trying-to-escape splicers.
The monsters could also be the splicers, kidnapping children to use them as Little Sisters.
They became so incredibly obsessed with ADAM that they came to the shore and kidnapped little girls in the hopes of obtaining ADAM.
Theory 2: The red lights are produced by the Big Daddies' suits and they are swimming with the suits on.
They are then kidnapping the children thinking they are Little Sisters.
Theory 3: The lights are (once again) the lights from bathyspheres of splicers.
The girls were formerly Little Sisters that plan to escape back into the sea.
EDIT: They say the red lights came from a
"lean figure", so the Big Daddy theory is scrapped.
However, this could also reinforce the theory that they are escaped splicers.
EDIT V2: The attacks seem to be centralized around northern Europe.
If I recall correctly, Rapture resided in the Mid-Atlantic.
So the idea of splicers doing said attacks is once again reinforced.
EDIT V3: Another press release stated that they saw the "red light" when their daughter was taken.
They also said that it "may have come from a flashlight, possibly mounted on a hat or helmet".
Also, the family saw the assailant wielding a "sharpened tool with extreme force".
As we all know, Spider Splicers wield hooks and can rip people apart easily.
However, where does this "red light" come in? No spider splicers had a helmet or red light of any kind.
EDIT V4: Aha! So it says the victims aren't all just similar in age, but appearance as well.
Could this once again reinforce the idea of the splicers believing they are Little Sisters and kidnapping them in the hope of getting ADAM?
Hunde Des Krieg said:
Lynch just seems like a conspiracy nut, none of the letters look in any way official, I bet he just follows the clues and somehow stumbles upon Rapture.
None of the letters are official?
Look at the one behind the picture of the red light.
It is a press release from INTERPOL, so clearly this isn't just a random, silly conspiracy trheory.