After the scuffle between Mann (Damon) and Cooper (McConaughey) in Interstellar, our protagonist gets a hold of a radio and alerts his shipmates to Mann's duplicity. Then his ship explodes. What happened there?
The way I interpreted this scene:
The mission coordinator sent robots to aid the humans on their journeys, not only to add company and tech/ physical support - but to counteract the human-element weakness/ strength - which is a theme in the film.
If a robot found that the world was uninhabitable - it was to self-destruct and kill the scientist, once it had sent a report of its findings (to prevent exactly what happened with Mann)
That is why I think he disabled/ tore apart the robot - and gave the lame excuse 'was using it to power my mission' - and why upon reboot - the reaction was 'this data makes no sense' - because the data was: 'planet uninhabitable' - the protagonist, antagonist and audience know this already - but the soon to be killed character just finds out, and is killed in an explosion.
(The robot at the end jokes about self-destructing, and as seen by the race to the main-ship - no weapons were ever taken, since it wasn't assumed there would be hostile life-forms - I would think they wouldn't have had explosives with them - it wasn't a mining/ prospecting mission, just analysing livability/ sustaining of life.)
These were world-class scientists - so could have Mcguyvered something from rocket-fuel and ammonia, and it seems cruel for the mission leader to murder his scientists - but as they said - they had no resources to recon all of them - and the 12 were willing to die to find a habitable planet. An explosion would be more humane than leaving them on an uninhabitable planet to slowly die.
When Cooper decided to leave to earth, Mann attempted to kill Cooper. Then, he flew using his shuttle and used the faulty maneuver to dock with the Endurance, which exploded the shuttle and killed Mann.
Amelia rescues Cooper, and the two give chase, arriving in time to witness Mann docking improperly with Endurance, which kills him when the airlock depressurizes