The children are the people vehemently demanding the DNC unilaterally employ their chosen platform, under the pretense that it would instantly solve their problems, and then subsequently abstaining out of protest. The political landscape is more complicated than that.
I've said elsewhere, elections are won on popularity, not policy. If the DNC unilaterally shifts to a pro-worker platform, all their wealthy donors shift to attack ads against them. Adopting more popular policies can ironically lose them votes as those policies get misrepresented to voters by propagandists.
Add to that the habit of progressives to abstain when a platform isn't perfectly catered to them, and you have an impossible situation where you're trying to court multiple conflicting demographics while the financial support you once had has been turned against you.