It's an entirely reasonable assumption.
Unless you're structural engineer or a stone conservator, with firsthand knowledge of the material in question, that is a very unreasonable assumption.
I'm neither I hasten to add, but general principles of conservation do apply - ie do nothing to an object that might possibly cause it damage. Prancing around on the lintels, as shown in the video above, constitutes a possible hazard to the monument (and in my book an unacceptably display of disrespect). It is also most certainly a health and safety issue - both to the clown who was doing the prancing and to anyone below him who would have been injured had he fallen on them.
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