This topic has been discussed so many times. 
Irreversible transactions are a huge advantage ,if you compare crypto to the paypal scam.In PayPal,you have to rely on the mercy of their dispute resolution process and the mercy of your customers.
Bank transactions are supposed to be reversible,but that doesn't stop all the credit card thefts.
The only way to protect ourselves against hacks/scams is to keep our passwords safe.
This guys says it all. Bitcoin transactions are supposed to be irreversible and secure since PayPal transactions are reversible. The bitcoin transactions don't have to be reversible to avoid getting hidden charge backs from the companies we buy services from. For someone like me, I always feel safe and happy when someone buys my product with bitcoin because there would be not disputes. I hate when someone buys something from me, instead of contacting me then they go ahead to create dispute on PayPal, that really annoying - scammers do that. Irreversible transactions are a huge advantage ,if you compare crypto to the paypal scam.In PayPal,you have to rely on the mercy of their dispute resolution process and the mercy of your customers.
Bank transactions are supposed to be reversible,but that doesn't stop all the credit card thefts.
The only way to protect ourselves against hacks/scams is to keep our passwords safe.