system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How/Why was there no escape plan or a backup plan in case the Jedi Temple was attacked?

I re watched RoTS and I realized as Anakin and the Troopers decimated the Jedi, I sat there asking. "Where are there secret tunnels? Or the mass evacs?" Most of the shots, you see them either hiding or one Jedi go up against like 30 Troopers only to get killed in no time flat.
gpt
The majority of the Jedi Masters and senior Knights were out leading armies or otherwise engaged on missions for the Order/Republic.

That meant the majority of the "Jedi" left at the Temple were Younglings; who either didn't know about the escape routes, wanted to fight too badly to think of using them, or weren't able to get to them because they weren't solo.

Combine this with the fact that Anakin was on the Council at this point and no doubt knew about the various escape routes, he would have sent troopers to go and cover any possible exits.

It's why the troopers were the perfect group to carry out the purge, all the Jedi trusted them, and the young Jedi who most likely had grown up with the Clones in their everyday life no doubt saw them as relatively harmless.