What he said!
and what kind of soil you using??
Sounds like root-rot or dampening off.. both soil-borne diseases... usually in soil that is too wet, or innoculated with mold. Try switching soil, and boil your water ahead of time and let it get to room temp. don't keep the soil wet, just barely damp.
I prefer to start them in peat pellets and grow to about 2" before putting into soil... peat pellets are more sterile as long as you use decent water.
No need for revenge, just sit back and wait.
Those who have hurt you will screw eventually themselves; and if you are lucky, God will let you watch!
Through What we create- we are immortal.