I haven't seen any problems, and won't.
If time travel becomes available in the future, it is obviously available now. I haven't seen any problems, and won't.
Hey there tkdboy 14 !
Although I do not subscribe to the notion of backwards time travel as described in your post, your set up is that the time traveler visits the past i.e. the instance when the visited beings were conscious. If the traveler visited a sort of mindless people then, the traveler is not visiting the past, rather a modified version of the past. This by definition would not be time travel.