They can be if you're over-levering yourself but to say any usage of leverage is dangerous ( I understand even $1 of leverage of riskier than $0) is crazy myopic. You've argued for years on here (along with myself) that Apple's cash position is too large/suboptimal. Well, if you believe that you should realize that optimal capital structures are rarely 100% equity. I'm sorry, but someone who is making $10m per year and chooses to get low-interest financing on a $20k purchase is not dangerous.
I did say, depending on the extent of the debt. In the case we are discussing here, the extent would be extensive.
You are right to remember that I've argued for years that Apple needs to keeps its cash position under better control, but at the same time, I've also argued that huge mergers and acquisitions are not the way to do it. Mergers are inherently risky. Adding debt to them just increases the risk.