Kill the traitor missions tend to be guarded by a couple of squads plus the traitor and his body guards. This comes to ~20 men I believe. Beyond that there may be the odd police patrol or base patrols if one is nearby.

You need to bring a full squad of decent AI to the hard missions.
Sometimes you can whittle the defenders down and send several waves.
If a mission is too hard for your current game state and/or you can't afford the AI members you need, you can just skip it. Not everything is doable all the time and the game doesn't hold your hand.

For kill the traitor, see if you can spot him and take him out from a distance and then running away without defeating all of the guards. You might have to wait a few minutes until he bleeds out to get the success message.

Meerkat の投稿を引用：

Kill the traitor missions tend to be guarded by a couple of squads plus the traitor and his body guards. This comes to ~20 men I believe. Beyond that there may be the odd police patrol or base patrols if one is nearby.

peterk の投稿を引用：

You need to bring a full squad of decent AI to the hard missions.
Sometimes you can whittle the defenders down and send several waves.
If a mission is too hard for your current game state and/or you can't afford the AI members you need, you can just skip it. Not everything is doable all the time and the game doesn't hold your hand.

For kill the traitor, see if you can spot him and take him out from a distance and then running away without defeating all of the guards. You might have to wait a few minutes until he bleeds out to get the success message.

Thanks for the responses, AI even at 20, plus any surrounding enemies, town guards/police etc seems high for solo to me personally. Is there any code changes I could make to reduce this Meerkat?

Not easily, but you could try looking for the code for the missions themselves to try and reduce the number of squads spawned. Naturally you do so at your own risk.

It depends on the skill of the player. We recently did this mission together with a dude, and it was comfortable, though a bit difficult. The main thing is to take a lot of ammo and take a good position.

Need to drive up to the target in a car undercover, and start the rush.

Watch videos by a guy named Kerbo. He almost always manages to take the target out from long range and gets away without having to fight everyone.
Grab a sniper rifle and scope out of the arsenal even if it's not unlocked yet. You can often spot the target through a window or in a doorway or standing out on a pier.
if you spook the target he's going to jump into a vehicle and he tries to drive to an enemy base, so you can be ready for that and chase him down before he gets there.
You don't have to fight the 2-3 squads.