I really heat any kind of bank whether it was PayPal or any other virtual bank , they are so easy to hack so there is no safety using it , i got my PayPal hacked a while ago and i tried to contact their service and they didn't even respond , luckly for me i didn't have a lot on that account because i exchanged all my funds into bitcoin.
Frankly, it was your carelessness that has got your account hacked. Maybe your password wasn't secure, you used the same password as your password in other website, your pc or mobile phone has virus or keylogger in it, etc. Regardless of what was the reason, it was your fault and not the website's fault.
If Paypal accounts are easy to hack because the website's database is easy to access, then people should've stopped using Paypal already. People should be ranting all around social media and forum sites. But right now, I'm not seeing any except you.