even if they think first, did they will think about consequence from their action ?
maybe mass sell will come from another side who have been waiting that moment.
just because end of the year will come and u think bull will comes too ?
Yes for me. Most of them are careless, like not thinking about consequences from their action(common with some newbies entering in crypto without understanding how crypto works). But for those big whales or big time people investing in crypto, for sure they are aware unless they are too much rich just to invest in anything that they don't know, like gambling or whatsoever (because they have lot of money, so whatever they do, does not matter anymore to them).
About the bull run, it's because of the block halving for me, not every end of the year.