I think these are the good steps being taken in order to secure investor, We must take this as positive and I think there is no  harm if we provide docs like passport, identity cards for verification.
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I agree.  If you really want to be assured you are not being scammed, this is what the landscape will look like for ICO very soon.  Likely to be more requirements and identifications not just a passport. 

In my opinion, this is what you want.  The ability to steal your identity requires more than just your passport information or driver license information.  Is this is a start? Yes.  But no financial institution or credit company will take just the photo of you passport and extend you a line of credit.  You have to provide much more than only this. 

What you want to do is look for an ICO with a strong security advisor in place.  Someone who has experience in Government Security or Tech/Network Security.  Anyone with security experience will tell you (even if they do not have a strong TECH Security Background) that segregation and compartmentalization is essential to protecting information.  Especially coupled with encryption.  So find the ICO that takes this stuff seriously and your personal information should be well protected.