Because it's easier. And you don't really need a Star Destroyer to kill a Jedi who's probably exhausted, and who won't be able to defend himself if the 60-odd clones behind him, whom he trusts with his life, all started firing at him.
Really, using a star destroyer's guns on a Jedi is like using an axe to cut butter. It'll work, but the table will be a mess.
Rancor-broke Order 66 conspiratards:
> Palpatine considered the Jedi the only threat to his (supposed) plot to become emperor and that's why he had them all killed
Also Rancor-broke Order conspiratards:
> The Jedi weren't important enough to turbo laser
Pick. One.
Next time, watch the movies. Kenobi was unable to defend himself from the 212th, and just ran away from them, but once he made peace with the fact that the clones were their enemies, he and Yoda had no problems cutting down 501st Legion clones AFTER Order 66.
It's hard for a Jedi who's probably getting tired in the middle of a battle to defend against several dozen friends of his who suddenly turned into foes and started firing at him. But if he survived that, made peace with the fact that his clone allies were now his enemies, and got some rest, he'd be able to cut them down like logs in the next battle. This is why, after Order 66, it's usually Vader, Clone Commandos, or some Inquisitor or Shadow Guard who hunts down rogue Jedi, not regular soldiers. Order 66 worked because it was a surprise attack against tired and exhausted foes. If your Jedi foe is rested, healthy, and no longer holding back, regular soldiers will have problems taking him down.
And if you hate the Jedi that much, may I suggest pestering some other sci-fi series? There's tons of other sci-fi series out there without psychics wielding glowsticks mumbling gibberish about some mystic force. Star Wars is, and will always be, the story of the Jedi. If you don't like that, then too bad. Hating Jedi for being the main guys of Star Wars is like hating the Space Marines for being the main guys of Warhammer 40K. Or hating the Justice League for being the main guys of DC comics.
See, here you go again. You "Order 66 was an inside job" types can never be consistent.
Is a Jedi capable of slaughtering an entire detachment of Clone Troopers? Or can one be taken out by a mere squad?
And you fall back on the lamest excuses.
"Oh see the jedi can easily slaughter legions of Clone Troopers but they were tired"
You're telling me that tens of thousands of Jedi (or hundreds of thousands if we're going by the number of Jedi that keep turning up having survived your
supposed Order 66) were all completely tired and exhausted
at the exact same moment everywhere in the galaxy?! And that Palpatine, who you lot CLAIM gave the order, knew when this exact universal moment of maximum Jedi fatigue would be, and at that moment issued the
claimed 'Order 66' that activated either the brain chips or behavioral programming (again, you Saber-foamers can never stick a story, its whatever your [[[masters]]] are telling you today).
This sounds reasonable to you?
Or is it more likely that soldiers in a battle against an unfeeling, remorseless enemy got tired of being sent on fool missions by a glow-stick wielding incel who refused to pick up a fucking gun in the middle of a war?
And no one is disputing that Palpatine was forced to send Vader and other forces to hunt down Jedi after the defeat of the separatists as they continued to try to disrupt Imperial operations being they were butt-hurt after the order was disbanded after their leadership attempted to assassinate the (then) Supreme Chancellor on fanciful charges of being some sort of Ancient Enemy of the Jedi - with zero proof.
In fact, in holos released after the same guy who provided the only supposed evidence of Palpatine being some sort of evil Jedi was shown to be slaughtering younglings in the Jedi temple.
How do you explain THAT - that in
supposed "destruction of the Jedi temple" the only person we see really killing Jedi & children is, in fact, a Jedi. Not just a Jedi, but a Jedi MASTER.
Clearly "order 66" is a myth. A Jedish lie to make them look repressed, when they did it to themselves.
All I saw was one psycho, who was a JEDI, maybe kill a bunch of Force-sensitive younglings who are NOT Jedi yet - we don't actually see them die - and some PTSD-scarred clones frag their Jedi officers after being forced to fight for years in hellish battle after hellish battle
A Jedicaust that does not make
This is exactly I mean. One Jedi - a Jedi MASTER sitting on their own council mind you - goes into a school with a laser sword and now the Senate wants to take our blasters?
There are holes in this "order 66" conspiracy that you could fly a Super Star Destroyer through, but Jeditards keep following [[[their]]] orders and parroting them like they the truth.