well, Janeway also made decisions for her crew that she had no business making. She stranded them in the DQ. If she really believed in helping the Ocampa, she could have let her crew go home, then stayed behind to set the explosives on the array.
The Maquis were drafted, if you remember. They didn't sign on to be members of her crew, so she should have shown greater flexibility in making decisions involving them, since unlike her Starfleet crew, they weren't even there even somewhat voluntarily.
From their perspective, Janeway stranded them and then drafted them.
Actually, it was the Caretaker that stranded them, and many others before them (like the Equinox). Janeway didn't have to offer them help. She could have left them high and dry, but she didn't.
We can't assume that their attempt to use the Caretaker's array would have been successful or that the Kazon would have given them enough time to figure out how to do it.
Once the captains decided to cooperate, Chakotay committed the Maquis to Voyager when he crashed their ship into the Kazon ship.
I guess it's just a matter of perspective.