I'm going to block someone's doors when I park
What is the reason for your thinking? Why are you choosing to block someone's doors when you park?
Because I feel like it, I don't want to be fined by the police.
It's rude to deliberately block someone's door with your car. You should avoid parking badly anywhere as this will lead to your car getting towed. If this happens, you will have to pay fines to get your car out.
That is a big waste of time. Plus that fine is small. I'm going to block it anyway since it's not a big deal.
It is a big deal to park poorly. This could be a huge inconvenience to the person you block in.