Nothing wrong with erring on the cautious side.....
And if they had stayed on and there was a catastrophic fire resulting from leaking fuel or hydraulics (onto the burning brakes) as a result of the heavy landing and a few passengers perished, the crew would be criticised for not evacuating the passengers.........right?
It's a given that one or two passengers may be injured going down a slide while evacuating but coming from the view that even small fires can become catastrophic in a very short time, I see nothing wrong with erring on the cautious side. We were not there and we are not yet privy to the communication exchange between ATC, the crew and the First responders that led to their decision........
Good call to evacuate.
The crew now has all the time in the world to debate over whether or not they should or shouldn't have evacuated and cost the company $ (insert your dollar amount here) per blown slide. I am sure that is way better that living with the idea that you were responsible for the deaths of passengers.