Why don't they ever put a microscope on the Mars Rovers..

So we can actually see if there are microbes....I don't get it wouldn't this be like the first thing you would need to really see it..?
I mean it's all cool that they heat up rocks and shake dirt around and blast it with lasers.. but when the dirt hist the road, isn't a microscope the best way to see whats in the "dirt" samples.
how many rovers now.....Just because they find a "fart" in a rock by blasting it with heat and radiation and what not don't mean crap unless you want it to mean you just killed the "first contact"..
they use microscope here on earth to find bacteria not lasers and crap...

The Mars Rover actually has a magnifying device. It's not as strong as a standard microscopic these days, but in makes sense. Remember, this is robot is being controlled all the way from Earth! It takes time for the electronic messages of 'what to do next' to reach the Rover. It would be ridiculously difficult for scientists to operate a microscope from another planet-microscopes need skill and precision, after all.

Also, the purpose of looking inside rocks is to see the extent of weather and surface patterns. When you compare the insides of a rock to the surface, that contrast could be of use to geologists. You'd be surprised how such insignificant objects can offer such insight!

We use concentrated bodies of bacteria to see them with microscopes - i do not think you understand how hard it is to KNOW that you are looking at a cell and to find that cell when it is sparse.
We KNOW there are no biofilms on the surface so any evidence will be sparse and we have no idea whet form the life will have so we would not recognize it if we saw it.

None of the Mars rovers are actually looking for life. They are looking to see if Mars has ever been conductive to life, among other mission goals unrelated to actual life on Mars. (Geology is a biggie).