Wikipedia:Collaboration first

Collaboration is as important as content contributions in a wiki community. While counterintuitive, this is because editors who are consistently disruptive and uncivil, temperamentally incompetent, or who bully or filibuster others into submitting to their will, will continuously alienate other contributors. Alternatively, Bold-refine is the ideal collaborative editing cycle.

These in turn become a wellspring of resentment and negativity, which worsens the goodwill of the project. New contributors or unregistered users are often pushed into corners through hostility by disruptive editors who border on bad-faith actions. These groups are protected by users who act as meatpuppets to each other for hazing and unofficial initiation using loopholes in the policy and guidelines rather than providing the support to which their victims are entitled, or working towards creating a harmonious environment for everyone.

A disruptive user or an otherwise productive contributor who cannot collaborate is not a productive contributor.