People are thinking new members of this community are fraud, because of people stupids in the past(DB,DN,..).
If you don't trust a user, do not say "beware, this guy must be theft". Simply, do not money to his business and shut your up until you sure it's a scam.
Also I don't trust and I won't invest anything, related to bitcoin.
That's like saying, if you have suspicions of someone being dangerous don't warn people about him/her until you're sure. That's ridiculous, there's no harm in warning people that this may be a scam since a lot of people with bitcoin will invest in nearly anything. Look at ponzi schemes for example.