Yes, this is a big concern. It's a form of zealotry, it's a demand for ideological purity, and that never ends well. It's just not conducive to rational thought.
Kind of strange that burning is stealing, but using a QC to hack someone else's private keys and take their coins isn't.
Who said QC attacks on ECC signatures to seize someone else's coins also wasn't stealing? Both are stealing, one in the pursuit of money, another one to prevent the loss of value of one's own stash of bitcoins.
Btw.: Satoshi has enough other Bitcoins than the known "lost" coins. He mined on several machines but we only know his "lost" coins. (our opinion)
No one's 100% certain these P2PK coins are all owned by Satoshi.