Re: Tiptoeing around the elephant in the room
No one will say it because they is no proof. Extraordinary claims - ie life on mars - require extraordinary proof and given standard chemical reactions can mimic many of lifes abilities when it comes to reactions and gasses here is little yet to get excited about.
Also bear in mind that oxygen was a poison to early life on earth and probably would be to any mars life too unless it had also miraculously evolved photosynthesis.