I think the word "deliberate" might be a little strong, because it's not one person's choice alone. It probably is laziness, but the way the road is made makes the lazy choice the one that screws over everyone else to prioritise cars. They could leave the van in the middle of the road, but drivers would get angry, so they make a subconscious choice.

Cars are large, cumbersome, dangerous objects with horns on them, and the road's design centers them. If you park in the middle of the road, cars are so space-inefficient that you cause a traffic jam and people get upset and honk, but nobody's in much more danger. If you block a pathway for pedestrians and cyclists, they can get around, but it's much more dangerous, especially for children and the disabled, but most of the time the delivery driver isn't forced to deal with that fact. Those people are much less visible.

So the result is that the mode of transport which causes the most problems for the people around it is also prioritised above all others. Decisions were made at the city planning level that put cycle paths together with cars. There are much better ways of doing things, for instance separate paths, with bollards so cars can't just leave the road. You could make delivery vehicles smaller and lighter, with dedicated delivery bays. You could narrow roads and slow them down to disincentivise inner-city traffic, and encourage the use of bypasses, and subtly teach drivers to expect frequent stops in town.