I try to read all that has gone before if I have a comment, but not necessarily otherwise.
It became a real problem on the AF447 threads, which amounted to thousands of posts. Newcomers clearly didn’t even try, and asked the same old questions or came up with same old disproved/discredited theories as others before, wasting everyone’s time except their own.
And one who looked a bit like a troll changed name apparently and started on his/her particular obsessions all over again - spotted by somebody else, and he/she never denied it.
Chris N.