  Published: June 14, 1998 (Page 2 of 5)  *The student killers
gave ample warning signs, often in detailed writings at school,
of dramatic, violent outbursts to come. The boy in Moses Lake
wrote a poem about murder, saying, ''I'm at my point of no
return.'' Similar jottings were left by the boys in the South,
and in Springfield. In virtually all of the cases, adults never
took the threats and warning signs seriously. Or they simply
overlooked them.  ''When you look at the overall pattern, it's a
pretty serious wake-up call,'' said Dr. Ronald D. Stephens,
executive director of the National School Safety Center, which
monitors school violence from its headquarters in Westlake
Village, Calif. ''We are seeing an increasing number of violent,
callous, remorseless juveniles.  ''What's behind it,'' Dr.
Stephens said, ''seems to be a combination of issues that range
from the availability of weapons to the culture our kids immerse
themselves in to the fact that many youngsters simply have no
sense of the finality of d