The first proverb, in the strictest sense of the word, is now being presented. And it demonstrates the futility of listening to, or following in the footsteps of, those who do not pay attention to the teaching of the word of God, and those who simply disregard the teaching of the word of God.
The net and that is spread, is the judgment of God.
The net is clear and plain to see by all. There is no one, not a single person, that is not aware of Gods judgment, or of the repercussions of their choices in life.
What this proverb describes, is that everyone, makes decisions, while they are fully aware, and can plainly see the judgment of God before them. And yet, the still make the decisions, like a bird that sees the net, but will still fly directly into it, and is trapped by the certainty of that judgment.
In vain, refers to the certain failure of the sinners action, and yet knowing that failure is certain, they are still enticed by the empty promises of the world, and will pursue them anyway, all the way to their own destruction.
Unbelievers, reject Christ, knowing of the Lake of Fire, and yet they will still pursue false religions, or no religions, or philosophies that have no basis in fact or reality, even in the face of rejecting simple thought of believing in Christ, which takes no effort whatsoever.
Believers in Christ, are obviously saved, but what is set before them is their spiritual life. And yet believers, knowing that learning Bible doctrine is necessary in order to grow up and fulfill their spiritual life, will resist a daily study, or will resist instruction, in favor of their own wisdom instead of Gods wisdom. And therefore they fail in the spiritual life, and fly directly in to Gods net of discipline and loss of eternal reward.
All people make their decisions, with their eyes wide open, knowing full well that their resistance to Gods truth, whatever it may be, whether intentionally or through plain laziness, has repercussions that will not go well with them one way or another.
Therefore, no one has an excuse for the failure that is certain to come, when God, and Christ, and the mandates of the Bible are ignored.