
Putting on my amateur astrologer's hat again, I thought it worthwhile to show natal charts of the five young males together in order to highlight any similarities. The simplest similarities, those I see as most significant are ringed in red.
Chart images follow a few notes:
In the natal charts of Cho Seung-Hui and James Holmes Mars and Pluto are conjoined in Scorpio. Mars and Pluto, two of astrology's potentially most malign and explosive factors in their ruling sign!
In the chart of Tamerlan Tsarnaev Sun is in loose out of sign conjunction with Pluto in Scorpio. So - Pluto and Scorpio featured prominently again, and in connection with Sun (the self). His natal Moon (though we don't know exact degree without a birth time) is likely to be in harmonious trine to natal Mars in Aquarius.
Adam Lanza and Dzhokhar Tsarnaev both have Uranus and Neptune conjoined in Capricorn, a generational aspect for those born in the early 1990s, but in these particular cases the conjunction links to personal planets. In Tsarnaev's case the Uranus/Neptune conjunction links to Mars in Virgo by trine aspect and in Lanzas's to Mars in Pisces by sextile aspect. That potent linkage to Mars again!

"Hate is one of the most extreme Martian vibrations, through Scorpio rather than Aries, and probable generally with an admixture of Saturn or Uranus. The last-named is often violent in its antipathies, and, like Scorpio, may remember slights and insults after long periods. In maps (natal charts) capable of nourishing hatred and revenge the benefics are usually obscurely placed."

Just on the face of it that sounds like a fertile atmosphere for trouble.
While preparing this post it struck me that the generation with a Uranus-Neptune conjunction in Capricorn in their natal charts could prove to be an interesting study in future years, as they continue to mature and come into their power. The eccentricity and unexpected change which connects to Uranus combined with the foggy delusion for which Neptune is famous, in the sign of Capricorn known for its ties to the establishment, status quo, business etc. could prove to be one of astrology's oddest and possibly "iffiest" combinations. The last time the two slow-moving outer planets conjoined in this sign was in the 1820s, so the generation born then would have seen, and been involved in, the mushrooming of the industrial revolution - arguably the biggest change humanity had experienced for centuries.
The five charts:
Birth data for Lanza, Holmes and Seung-Hui taken from Astrodatabank, for the two Tsarnaevs it was gleaned from available sources, so may not be 100% accurate. Charts set for 12 noon where birth times are not known.
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Cho Seung-Hui (Virginia Tech massacre 2007) born 18 January 1984, Seoul, S. Korea |
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James Holmes (Aurora theater shooting 2012) born 13 December 1987, San Diego, Ca. |
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Tamerlan Tsarnaev (Boston Marathon bombing 2013) born 21 October 1986 in Kyrgyzstan |
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Adam Lanza (Sandy Hook elementary School shooting 2012) born 22 April 1992, Kingston, NH. |
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Showing link to Mars - sextile aspect |
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Dzhokhar Tsarnaev (Boston Marathon bombing 2013) born born 22 July 1993 in Dagestan |
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Showing link to Mars - trine aspect |

Postscript: Yet another ill-famed young male had slipped my memory while preparing the above: Jared Lee Loughner, born September 10, 1988. (Shooting in Tucson, Arizona, on January 8, 2011, shot and severely injured U.S. Representative Gabrielle Giffords, his target, and killed six people.)
Not as clear a similarity here, but there's still at least one Mars/Pluto link. From the small chart a Yod (Finger of Fate) can be seen with Pluto at its apex linked to Jupiter and Mars by two 150* aspects. Astrologers would interpret that as the "energies" of the two sextiled planets, Jupiter (in Gemini) and Mars (in its own sign Aries), being channeled through Pluto (in its own sign, Scorpio) at the apex.

