Statistics show that around the 6,500,000 people thathave bought minecraft, are safe from viruses, malware etc. And btw, if you don't trust minecraft 100%, then why did you make an account here? That proves that minecraft is safe. :D

Its safe 100% if you buy at www.minecraft.net

"Safe" is a relative term. Will it harm your computer in any way? No. Will it try to steal your bank account information? No. Will it try to steal any information from your computer, or create ads? No. Will it cause you to lose sleep because all you can think about it what you want to build next? Possibly. Will it create an addiction that consumes you? Maybe. Will this addiction cause you to play for long hours, losing friends, sleep, and weight because you forget to eat? Maybe. Will you start seeing the world around you and start having dreams where the world is made of pixelized cubes? Hopefully not. But will you love every minute of it? Yes. Go for it. Buy it. If you have doubts, play classic for a while, it's free, and it helps get you involved before spending money.