You said "Janeway", not Tuvok.
It was Tuvok's descion to go back and get them, not Janeway's.
Your argument holds no water here.
If Janeway had ordered them to return, then, yes, you have a point. But, she didn't. She gave direct orders for them to not turn around.
Indeed... she gave Tuvok orders not to come back for her and chakotay because that's the way she is.... she's the captain and he was the 1st officer/captain of the maquis..... they had a responsibility for their crew's safety and to get them home..... many times she attempted to sacrifice herself for the well being of the crew or at the very least, put herself in danger....
.... but whenever it was some other member of the crew, she wouldn't have any of it.... just look at what happened when Chakotay took off for Seska and the Kazon and told them not to come save him.... she did it anyways.
Or when Seven sacrificed herself to save the ship and crew from the Borg and was taken back to Borg space.... Janeway took the ship all the way back to get her..... when if they didn't, they probably would have gotten farther then they did with the trans warp coil they stole.
She had a double standard for herself and her crew...... thus to expect Tuvok to actually follow her orders of not coming back for her when she wouldn't.... would be illogical

Seven would make a better commander than Chakotay, she challenged Janeway's decisions far more often. Trouble was she also defied Janeway more often while Chakotay was basically Janeway's bitch.
Seven still had a lot to learn about humanity. She was also an emotional adolescent - I have to wonder if her "defiance" was a move to appeal to the desired male adolescent demographic.
Didn't appeal to me in that way.... she just appeared to be an adult teenager testing her boundaries with her mom who laid down some rules she didn't agree with.