Was it right for the affected party to write messages on the wrongly parked car?

UPDATE: Trending.pk was contacted directly by a witness of the scenario that took place at Jinnah Super Market, Islamabad. We felt it was important to update what they had to say about the issue, clarifying the details:

For privacy concerns, the contact is being kept anonymous.

It was last saturday 7-8pm i was there. Pretty much witnessed the scene.1915 was called by a lady twice or maybe thrice.They came after the situation was resolved and their office is right behind pappasallis. I.e. 2 mins drive. I am posting this everywhere ppl r saying they shud have called 1915…I don’t want misinformation to spread while we saw the actual situation happen. And this whole scenario continued for one good hour. Where initially the first priority of ppl was to involve the police..seems like they didn’t want to be involved.

Last night, someone parked a car in a very wrong spot in Jinnah Super Market, Islamabad.

According to the people who were immediately affected by the wrong parking, it belonged to middle aged man/woman.

The car was wrongly parked in front of the street next to Papasalis, a popular dine in restaurant in Islamabad.

The way the car was parked, it blocked the only exit and according to witnesses, about 50 cars were blocked behind it for at least 30-40 minutes.

An Islamabad resident had their car blocked by this wrongly car parked. The said party was a family visiting Jinnah Super Market with infants, elderly and disabled.

They honked for the car owner to return but he never returned. After waiting about 30-40 minutes, the affected party went on to the car and left messages on it with a temporary marker which can be seen in the images below.

Also according to witnesses, the wrongly parked car owner was informed countless times for his mistake and he refused to move the car which caused distressed to a lot of people in the area by blocking the traffic flow and making it impossible for nearby parked cars to leave the parking area.

Was it right for the affected party to take law in hands?

Even though the car was wrongly parked and caused distressed to a lot of people in the area, was it a good course of action to punish the car owner by putting messages and marker lines on his car?

Even if someone did this deliberately, the right course of action would have been to call the traffic police on the scene. Islamabad traffic police is available to help out round the clock by dialing 1915 from your phone.

What do you think? Did the accused deserve judgement from other citizens or was it better for the affected to call the police?