Perhaps those methods would be helpful in many ways for Ash to further her goals if they were spread further, but it could just as easily create more problems that would need to be dealt with later, especially if it resulted in a lot more unwanted chaos.
The Kane family were the worst possible choice for her in many ways, but they were effective in the way they handled things, even if they did not use methods that Ash agreed with.
Their way of dealing with things was to take advantage of the chaos that was spreading along with the fear related to all of the events that would take place in the chaotic era that was currently developing.
The Kane family had a long history, so it must have possessed a great deal of information about the past to allow them to know many things that other families would not be aware of.
Perhaps they noticed very early on the changes that were taking place, so they saw it as an opportunity to exploit for the sake of their goal.
