the episode makes no logical sense. It is assumed that one of the 3 people with the tattoos is red john. Then, one of them dies in the explosion. OK till now. But why on earth are we supposed to believe that RJ wasn't the sheriff? Why the fact that he randomly died in the explosion cleared him of suspicion, and the prevailing assumption is that one of the other 2 is RJ? RJ cannot die in an explosion? :)

Also the explosion itself doesnt make any sense. Who would benefit from it? If red john is responsible for the explosion, and he is one of the suspects, then he risked his life and the life of his followers with no apparent reason. Is he a suicidal maniac?
If red john is not on the list, still he risked the lives of his followers, and why would he do that? Since he is not in the suspects, and he is clear, why make such a bold move? If it wasn't Red John who planted the bomb, who did it? Noone had interest in killing all those people in that house, or randomly putting their lives into risk. The only explanation I can come up with is that RJ is responsible for the bomb and that both PJ and Blake group are trying to catch him, so he found the opportunity to take them out at once, which both contradicts Reede Smith's testimony and also breaks the 'elegant killing touch and signature' of RJ throughout the years.

Can someone pls explain to me who would put the bomb and why?
thank you