I guess that tracks because Thanos is stupid as fuck.

Trying to solve the resource problem by killing half of the universe just doesn’t help. In a couple of decades, the population would be back to the previous number.

He could just snap his fingers and make those missing resources appear. Whole empty planets for people to live with abundance etc.

It feels like he thought of the problem for like one minute and decided to take the easiest short term solution possible.