Whew, lads. An awful lot of butt-hurt people in here who like to think they have all the answers. I'm sorry one streamer made JonTron spout his borderline white supremacist ideals.
Do you know what species of animal isn't capable of making decisions and are fuelled to a huge degree by their environments? Humans!
This video demonstrates a concise view on the philosophical idea of 'Determinism', the current thinking on it, and how it is an ironclad argument in philosophical circles. It's often pitted against Liberterian Free Will, and the latter often fails under intense scrutiny, where Determinism does not.
So, what is it? Everything any human does is determined, same as the matter and energy that swirls about the universe. We are all on our respective courses as is dictated by the matter and energy in our brains - the neurons that fire in different areas command us to act in certain ways as dictated by a combination of factors.. and that feeling of 'being free'? That we are making our own choices? That, to, is just another thing our bodies produce to keep us acting in certain ways, made up of a series of environmental and historical patterns we've been witness to. Afterall, we're just animals. We're just highly complex ones.
What does all this nonsense have to do with Destiny? Well- it's simple. One of the foundations of current leftwing political thinking is very deterministic in nature. I.e., if we set people up to fail, they will continue failing.. therefore the best way to help people is to build them up as we're able (through social welfare programs and the like) so that they're less likely to fail.
Unfortunately, society has set up the black population of America to fail in the past. In the very recent past, no less. Americans bought them as slaves, bred them for obedience, regarded them as less than people, and when they were eventually freed - they still faced constant scrutiny, hatred, and prejudice, and still do to this day. Society, unfortunately, does not fix itself quickly; it takes generations and generations for large groups of people to break out of a cycle. Left-wing politics likes to ask, "Is there any way we can speed this process up?" and tries to apply social sciences to this problem. They often work, but sometimes fail.
Long story short? I think the view that we (leftists) regard black people as 'children' is a very simplistic angle to take, a strawman you've built up that you're immolating before our very eyes. The truth is that we think humankind as a whole is unfortunately quite predictable, and sections of us can get stuck in cyclical states and may need a boost in the form of policy-making.