The guy had actually welded himself into the dozer when he started the rampage (using a portable oxyacetylene unit which he had inside). So there was no way for anyone to get inside but also no easy way for him to get out.
The tourist value would have increased exponentially if they had just left him inside and never cut him out.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13