OP, you are right, most of these methods are very effective at killing. The problem is that you will also be killing not just your target, but a large number of people that may be for your own cause.
>gets hellfired by a drone
This is not a point target method, a hellfire missile can destroy multiple houses, or an apartment complex, how is this a good way to kill a single rebel?
>gets Jdamed by an F-16
Same thing as above, you might be killing lots of people who agree with you.
>gets hit by a long range cruise missile
Same as above
>gets hit with chemical weapons
This could destory an entire city at least, probably at least a county
>gets bombed by a B-52
Same as above, youll destroy entire cities
>gets strafed by an A-10
A-10s dont strafe one person, they kill large groups
>gets napalmed by a F-22
napalm bombing is also designed as an area target weapon, killing many
>gets nuked by a B1b
A nuke? really? this will take out a state for sure
>gets tanked
Tanks are designed to take out armored targets. What are you going to use these for? to destroy large buildings which may house one or two rebels? what about the rest of the people living there?
>gets mortared
Again, an area target weapon
>gets shot dead by a SEAL team
how many SEAL teams are there? enough to raid even 1% of US households without casualties?
>gets shot by a soldier with a proper full auto gun
This is the only realistic tactic, but requires you to have an actual target
In the end, even if 1% of the population disagrees with your agenda, how many people who agree with you are going to die? Using these methods, you will easily surpass any other 'evil' leader in killing your own people. Are you OK with this?