Why didn't the constitutional convention's delegates decide to let the people directly elect the us president?

The delegates thought that the people weren't intelligent enough to vote for president or any other position for that matter.

to contain the wave of communism

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.