Do I get upset at warbirds flying? No. That's enjoying history, a living specimen. I shoot my milsurps with joy.
Would I be upset if they cut up P-51's and made a different plane out of them? Yes.
See the difference?
You will use the argument that there were millions of mausers made...and that's true.
And, I will counter that 40 years ago you could buy K98k snipers for a song, they were everywhere. You could buy Krags, AG42's, 03 Springfields, all in good condition and cheap.
What happened? Seen any good cheap Krags lately? People took them for granted, butchered them into sporters and the rifles are gone forever.
Put it in a scenario that should make some sense. You buy a Model T ford used in 1946. There are plenty still running, tho obsolete. Not really worth that much, tons of them around. You chop it into a bucket roadster, hop it up and make a rod. Cool, and no one begrudges you your right to have fun and make something neat from an old car. Everyone does it.
But, fast forward to now. What's a good condition, all original Model T worth?
What's your hot rod worth (assuming it's still around)? Not much.
You can wizz on history if you want, care not to acknowledge it or even tell yourself that these rifles aren't worth anything, but future generations will curse you the way I curse the fools who cut up Arisaka's & 03 Sprinfields to make lamps & ugly sporters out of.
Add to this the stupidity of throwing $500 to $1000 into a gun that when completed won't be worth half of that (think I'm wrong? Go to Auction Arms and see what sporters sell for). And what's worse is that you can buy or build a better gun without cutting up a warhorse. I just can't understand the draw of it, unless you're just mean.