I guess GMs draw strategically. If their colleagues couldn’t draw either, strategy would be different but not worse for them. Maybe they’re thinking that way.
IMHO one reason GMs have a lot of draws is that they are so good that they seldom make mistakes. When two of them play each other, each knows the other is unlikely to err, so they concede a draw easily.
Their level of chess is so much higher than ours, that we have trouble understanding this concept. So we look for ways to blame the GMs, and for artificial ways to discourage draws.
GMs make fewer mistakes and they know a lot of ways to draw a game. They are very tough to beat. But I don’t believe they can produce draws at will, most of them anyway, especially with modern dynamic playing styles and openings.
As Joel Benjamin says in his current online article, if 2 GMs start playing an even position, it may not stay even forever.