Online systems are more secure than paper. Think about using a debit card versus a check. A debit card is slid in the machine and you enter your PIN, the transaction is processed by machine. The only human interaction is the teller entering the cost, and you see that happen right in front of you. On the other hand you write down the amount on a bit of paper that has your account and routing number, name, address, phone number and Driver's license number (thanks to the paranoia of bad checks). The check can be "washed" by scammers and re-written; that check has to be handled by the clerk, handled by the manager who takes it to the bank, handled by the bank teller, sent to your bank, handled by the teller at your bank, etc. Every one of those is a point of failure.
The point of failure in most online systems is with the user, not the system.