Very rarely do they ever feel guilty over bullying to commit
suicide. Usually, the worst of the bullies never feel that level of
remorse. They feel they were justified or that they were helping to
further evolution.
But then again, sometimes bullies are victims of abuse or
bullying too, or they may have other problems such as substance
abuse, so they might commit suicide. Bullying might be like a pain
reliever for them, though not an effective one, so maybe it is
possible to bully others and then also commit suicide.