As others have said it’s a government position and it’s delivering mail. I’m not sure if Canadian law, but in think that’s a pretty severe crime in the US.

What if the person didn’t want to deliver medicine because they believed that god will heal everything?

While the mail is hateful, it needs to be delivered.

Also consider that someone paid for the flyers and paid to have them mailed. So this guy is effectively robbing them of two different transactions.

To be clear, I don’t support the flyers in any way, but what the guy did was wrong.