65 anniversary of Katyn massacre

[Franek Grabowski]

Weird, a thread was closed to avoid a discussion on a subject that is clearly defined and not to be discussed.
A UN convention on genocide of 1948 in article 2 says:
In the present Convention, genocide means any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such:

• (a) Killing members of the group;
• (b) Causing serious bodily or mental harm to members of the group;
• (c) Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part;
• (d) Imposing measures intended to prevent births within the group;
• (e) Forcibly transferring children of the group to another group.

http://www.hrweb.org/legal/genocide.html
Several actions of Soviet Union fit the definition not only in regard of Poles but also other nations like Chechens, Tatars or Ukrainians to name a few.
Why to discuss the obvious?