I don't think he's incompetent, I think he's dishonest and crooked. He's everything that is wrong with lawyers. He cares nothing about the truth; nothing about the facts; and the ends justify the means.
In this case, from what I saw in closing arguments from the Kyle's counsel, the prosecution offered a last minute video, doctored to show something that never happened. The prosecutor should be brought up on criminal charges for that. (Had something to do with the drone footage showing something that would have indicated that the AR-15 was in Kyle's left hand, when in fact it is a right-handed rifle, whereby the spent cartridge would eject into the shooters face if used on the left side)
For sure the prosecutor has been paid