To say there is life on Mars at least life as we may know it is illogical at least not a permanent civilisation.It would not surprise me at all if it were a waystation but not to house a civilisation.

I'm a firm beleiver that way in the past the planet itself would have been a thriving planet and would have been similar to earth, note not the same similar, that the inhabitants for whatever reason migrated somewhere else, similar to what they were used to and if they did they would have been advanced even lived here for a time , mingled a bit, left us knowledge and moved on to a better climate. Mars probably was a populated thriving place when our ships do arrive there I'm sure we will find that it was the case.
Now we to are mastering space travel and we will move for the very same reasons , lack of resources.

To me this sounds logical no we are not alone but gee does everything have to be hostile, maybe there is hostiles but something tells me not the original residence of mars and maybe we are more similar to them than we think.