Because you're so insistent on the word "stealing": Isn't that technically part of ANY time travel? Just looking at one of the most popular time travel movies, Back to the Future: Marty changes the future so that his dad is now a succesful scifi author, his mom is, afaik, a lawyer, and his two siblings have successful careers, too. The consequence of all that is that other people had their future stolen. Another scifi-author didn't get a publishing contract, other lawyer didn't get the job, other candidates didn't get to enroll at the same school, and so on.But I've never seen any widespread "Marty is a pathetic loser who stole others' future" complaints.

Time travelling and changing ANYTHING could always boild down to "stealing". But nobody complains about it. You do, exclusively on this anime. Just find it weird. :>