Lucifer roughly translates as "morning star",

That is one of those religious bullshits someone made up to manipulate people. Lucfer is the name of an angel that rebelled against God and was banished from heaven. Giving his name additional meanings so you can make claims about him based on those additional meanings is bullshit.

Venus is called the morning star because in the early morning the light washes out all the stars and only Venus is still visible. It appears to bring out the sun. Venus is the light bringer.

One plausible explanation for how Lucifer became associated with Venus goes like this: the Natives in America used to worship a God that they appeased by offerings of pain and suffering. They would brutally torture captives, especially settlers they captured, in order to please this God. The settlers categorized this as luciferian worship, probably because they seen similar things from pegans in Europe. One of the settlers told the Natives that Venus was Lucifer and they should pray to that instead of torturing people.

I personally find that story dubious, as I find most religious stories dubious. But the validity of the story is irrelevant. What matters is that it could have happened like this, or in a simmilar way. Because, frankly, this makes a lot more sense than anything as to why lucifer is associated with a planet.

At the end of the day these kinds of "this name means that" is ultimately a centuries old game of telephone. Trying to extract meaning from the minutia of the resulting gibberish is foolish.