Everyone knows
that the surface of Mars is absolutely and instantly toxic to human life.
The merest contact with Martian dust is fatal. It also oxydizes you to nothing instantly. Everyone knows this.
And the radiation sterilizes you before the dust kills and disposes of you.
Ultraviolet radiation fries you before the GCR and solar particles sterilize you and the dust kills you and oxydizes you to nothing instantly.
All the water on Mars is poison. Filled with instantly fatal contaminants. Everyone knows this.
That's why there can't be any life on Mars.
It's all true, and everyone knows it. ;-)
Cheers, BRFelix