Are they not against forum charter anyway? There is no point of discussion and no opinion usually given in the OP. They more likely stem from a twitter like post announcing a death, followed by pages of posters parroting RIP. There are better ways to show your condolences and certainly more appropriate ways - like signing the book of condolences for example.
I'm an ardent anti FF poster, I think they've been disastrous for this country but I can still obviously see the sadness in a death. Brian Lenihan was a nice guy, personally and politically, but his decisions within government and the FF party have been detrimental to our sovereign and economic standing. I would however NEVER welcome his death - he is not in the same league or even the same game as Osama bin Laden. It is sad for his family and friends and anyone who knows what a bastard cancer is.
But RIP threads serve little purpose on a politics forum. Even a deaths and notices stick thread where people can thank an announcement to share their condolences would seem more appropriate, and I often think people rush to announce deaths on here to morbidly 'collect' thanks.
Previously other types of monotone threads have been started by posters on a topic and periodically supported by mods. An example being the 'positive things FF has done'. I can remember being warned when actually debating these positives by introducing counteracting negative policies which outweigh those positives. Threads need to allow for debate, so in the FF example it's better to debate all of the actions of The party (on a particular topic) and then weigh up the positives and negatives.
I don't really agree with cutting critical threads the very minute someone dies but on this forum it seems more appropriate to discuss a politicians legacy / their constituency work / their agreements and disagreements with party line etc.. and in the case of Brian Lenihan, the state of cancer care and the funding of cancer research in this country would be a nice topic. So by all means say 'RIP', acknowledge the human side to political life but please add some content to your post and not revise the past political careers of now dead politicians to paint them as great thinkers and patriots.