Tech mogul Elon Musk has reposted a video of Donald Trump blowing up President Joe Biden just days after an assassination attempt on the former president and Republicans bashing Democrats for what they characterized as violent rhetoric. “Best AI video to date,” gushed Musk, who is now contributing $45 million a month to a superpac backing the Trump campaign. (“We have to be nice to him now,” Trump said at a rally Saturday.) The posted cartoon video by @Cyncratic is a remake of the final fight scene in the 1999 sci-fi film “The Matrix,” starring Keanu Reeves as Neo, which features alien-enslave…