Among targeted individuals, rumour has it that the rise in mass murders (etc.) is at least in part due to electronic harassment where synthetic telepathy operators promote the idea for an individual to commit such a mass murder. This rumour is driven by the assumption that people in security or intelligence would be willing to do such things in order to legitimize requests to legislatures for larger budgets.
Consider this: a major power would generally have a greater interest in causing terrorism (etc.) outside of its own borders, as opposed to causing terrorism inside its borders. And, moreover, the additional resource allocations would a) redirect security allocations from potential international allocations towards internal allocations (in a situation which may also in aggregate eat up more economic resources).
In the meantime, the situation is one where the West is relatively open, while Russia (especially) and China are fairly closed countries. Considering that the expected response to mass murders and terrorism would be expected to increase the extent to which information is collected and processed (under the theory of them being caused by the CIA et al in order to justify larger budget requests, and increased monitoring of any and all civilians being one of the main things they might be expected to do with such budgets), it is worth mentioning that this situation implies huge availability of information on huge volumes of Western citizens that could be taken by China or Russia (etc.) whereas the opposite hardly applies because China and Russia are fairly closed countries.
That having been said, the view that the massive rise in mass murders may be the result of nefarious actions by domestic (to the USA) actors for the reasons mentioned initially does not seem all that crazy …