Exchanges dont care for anything else then profit.
They will list scam coins as long people will pay for votes for enlistment.
Right and exchanges has nothing to do with this because nothing kills bitclin but users,if we stop using this coin for trading or even in transactions this will continue fall,so what will save bitcoin is us and nothing else.
But in other issue ico scamming is one big reason thats why investors now are starting to back out and this must be stopped or give actions because if th continues then maybe whole market will die