there is great deal of time left before any meaningful news will surface that can act as a catalyst.
since the market rose on decreasing volume, the highs were not credible. So the risk was that the market would succumb to profit taking.
since a great deal of people are still long this market, the institutions can run it down and break as many stops as possible.
plus the global interest rate environment is still hawkish, with the bond market testing monthly lows.
so if you think profits can improve substantially from here on, and the business cycle is still robust, then buying the market would be prudent, but at the same time you have to weather short term movements.