there's a word for that. it's ignorance.
that being said, ignorance may perhaps be bliss, but not in this context. this is actually a marxist argument; it's plato's allegory of the cave. you don't know you're enslaved if you don't know what freedom is; if you don't know the history, you're not shackled to it. maybe there actually are some problems in the world that you can solve by wiping the blackboard clean and starting over, and maybe there is some truth in the idea that that's going to have to be done here at some point, but what that tactic is missing is overwhelming force. when does a year zero happen? it happens after annihilation, and we've seen that in...history. yes, the historical precedents for abandoning history (this is necessary if you don't want to fail miserably.) are after brutal attacks of the plague, catastrophic wars, devastating natural disasters and what not. if you want to abandon history and start fresh with a tabula rasa in israel, you probably either need to drop a nuke on jerusalem, or you need to let netanyahu finish the job first. hamas is not going to ignore the recent history, and israel is not going to abandon it's historical pretexts, but if you pound gaza into the ground enough, and kill enough of the opposition, they'll have no choice but to start over again.
right now, there's a contradiction in asserting a new beginning, without enforcing an end to the old paradigm, and it won't work so long as that contradiction exists. unfortunately, the point of intervening is to prevent the level of destruction required to get to an endpoint.
this seems to be doomed.
but there's a kernel of what is perhaps helpful thinking in it. starting new is a good idea, it's just that you have to let the process finish, first.
destruction is not always negative. sometimes, destruction is required to rebuild. - blixa bargeld (paraphrased)