You mean like using Using sophisticated techniques, they extract the preserved blood... from the mosquito, and bingo: Dino DNA! And Using the complete DNA of Frog to fill in the holes and complete the code!?
But I suppose you are correct, I still worry about these types of things though, we are meddling in stuff we aren't suppose too, and besides............Life Finds a Way.
There must be dozens, if not hundreds of instances where species from one continent, say, Asia has been introduced to North America and significantly changed parts of the biosphere, species like the Asian carp which have largely taken over the Great Lakes. Or the zebra mussel from Russia which was introduced into the Great Lakes by ships emptying their bilges.
And how about Dutch Elm Disease and Chestnut blight, both imported tree diseases that have transformed many thousands of square miles of forest?
Then there are invasive species. On my property, buckthorn and honeysuckle plants gone wild are replacing much of the natural undergrowth and inhibiting new tree growth in forested areas as they are over much of the United States.
Virtually all of these invasive species grew elsewhere on earth for tens of thousands to millions of years before being inadvertently introduced to the American biosphere where in many cases they have few or no natural enemies to keep them in check.