If blue spheres and red spheres both explode, but blue spheres explode 25% more often. Would you hypothesise, discuss and test whether or not it might be it's essential blueness or would you prefer to avoid the most obvious difference and shy away from discussing it? Does that sound reasonable to you? If it is blueness, you will arrive at an answer much faster if you're allowed to investigate and talk about that. Perhaps then they can explode with the same frequency.