For several reasons.
Let's examine those reasons.
Firstly, he is on the wrong side of the road. Actually he is more than just on the wrong side of the road, but let's at least establish that he is on the wrong side of the road, to begin with.
Secondly, there is not much traffic on either side of the road, is there? Not that traffic congestion should be a reason to break traffic rules, but at least you could that out as a mitigating factor in those conditions. Understandable, if still not acceptable.
Thirdly, because he has chosen to use the pavement for driving. Not the road. Not even the wrong side of the road. He is driving on the pavement, on the wrong side of the road.
Fourthly, because he is on the pavement, the lady in the yellow sari has to walk on the road. It is a testament to the infinite patience and fortitude of the forlorn pavement trodder who has to keep his or her eyes on not only the pavement to watch out for uncovered manholes and potholes and gaps in the pavement, but also on vehicles on the pavement. All in a day's work. Inconsiderate idiot.
Why is he on the pavement? Well, he did not want to go to the other side of the road, drive up, then take a U-turn to come back on to this road. So much easier to simply take a turn on to the wrong side of the road, and the ride up the pavement for convenience.
Fifthly, he is driving without a helmet. It should not matter, since the helmet would be on a head that has long since stopped working to figure out what is right and what is wrong.
It only makes you wonder in what else walks of life he has internalized the philosophy of such shortcuts. At his job? In his friendships? In his relationships?
To say it using the words from the greatest movie of all time - Sholay: "khota sikka to dono taraf se hi khota hota hai." (खोटा सिक्का तो दोनो तरफ़ से ही खोटा होता है )