man thats wired and scarry to three black holes colliding that might not be good for the planets around it colliding three black holes could mean that it could be bigger and stronger then a regular black hole

Well yes, they would be "bigger and stronger" than a single black hole. However, any planets orbiting these types of systems would probably have already had their life wiped out from the supernova that occurred when the black holes formed.

An interesting side note, however, is that the supermassive black holes at the center of the galaxy (millions or billions times the mass of our sun and the black holes being discussed in this article), are believed to form from these type of mergers, hence why this research is so important. If you want to talk about big, strong black holes, these are the guys to look at. However, since most stars like our own are not losing angular momentum, we will simply orbit the supermassive black hole in the center of our galaxy indefinitely, instead of being consumed by it. The only stars/planets that would be at risk are those who were really close to the black holes to begin with.