Trolling is Kin-selection

Trolling is simply a projection of power, to 

(a) ( unilaterally ) identify carriers of traits, 

(b) ( unilaterally ) induce carriers to reduce their 

• (b1) carriage of traits, or 
• (b2) trait detectability

(c) ( bilaterally ) engage in negotiations regarding (a) and (b).

Trolling is simply a security mechanism. It is efficient for (a, b), but for (c) it may not be the ideal method. It can be argued that (b) is more effectively approached as a bilateral activity, and hence should be regarded as a group (b, c) instead of as a group (a, b).

Decisions are left to the individual actor, about whether to project power more unilaterally, or more discursively.

Pro-social cultures regard a-social approaches as anti-social, and thus immature.They would argue that there is no such thing as an a-social culture, as no culture arises between less than two actors.

Pro-social cultures may mistake trolls for "attention seekers" - whereas the latter are a differently motivated species of actors, and thus the behaviour of attention seekers may be classified differently from that of trolls.

Trolling is kin selection.

Further reading : "The Internet dictionary, NetLingo, suggests there are four grades of trolling: playtime trolling, tactical trolling, strategic trolling, and domination trolling." - Wikipedia : corresponding with the respective intents of violence in general.