Let's see how things went:
1. PayPal cuts off Wikileaks
2. Anonymous rallies people to target PayPal with LOIC DDoS
3. ...
4. People start getting arrested
5. Anonymous calls for people to cancel their Paypal accounts
How it should've been done:
1. PayPal cuts off Wikileaks
2. Anonymous calls for people to cancel their Paypal accounts
Major difference!
I don't think you realize how Anonymous works, or that the people involved in step 5 are most likely not the same people as those in step 2.