Because it's idiocy and it's going to create great hardship for already impoverished people.

Read up on Sri Lanka's big move to being exclusively organic produce. They couldn't afford fertiliser imports so banned all fertiliser and pesticides. It was an unmitigated disaster.

The same is happening here. Their economy is a train wreck, no one will sell them fuel because they don't have any US currency and their own currency could be worthless tomorrow.

This law just makes corrupt border official shenanigans more lucrative. They'll repeal it in 6 months or so when there are riots.