Invading another country costs a lot of:
- Human lives - and it's much higher in the invaded country, in modern war.
- Political capital if the war is not uber-popular at home (citation: Vietnam, Iraq).
- International goodwill unless you are in super-rare circumstances (like first Gulf War).
As such, the cost/benefit ratio to USA of invading Venezuela is pretty low, even assuming invasion will succeed - which, as we again learn from Vietnam, isn't a guarantee.
This is compounded by the fact that Chavista rulers are still somewhat popular - a large minority (22% as of this poll in 2017) still supports Maduro. You may recall how much PITA a small minority of Saddam supporting Sunnis gave USA in Iraq.
As an additional consideration, look at three last US Presidents:
- G.W.Bush: already swallowed more than his political capital could chew on with Iraq War. Venezuela wasn't anywhere near priority.
- Barack Obama: wasn't as ideologically opposed to Chavista regime as a Republican president would; and was an opponent of invasions as tool of politics (see his criticism of Iraq War).
- Donald Trump: Openly ran for Presidency on a platform of international non-interventionism and stopping to spend US money and lives on behalf of other countries.
None of them would be terribly interested in attacking Venezuela even if they weren't prevented by cost/benefit analysis above.
As bonus points, let's address your suggested benefits if this happened:
will ends the communism franchise that is spreading like a decease in Latin america
This is debatable at best. Vietnam helped spread leftism in USA more than stopped the spread of communism world-wide. Iraq War helped grow Islamism, not stopped it. Heck, some anti-Maduro Venezuelians are likely to turn anti-US and join Maduro if we invade, out of understandable nationalist/patriotic sentiment.
will bring better energy plans to USA since Venezuela has a lot of oil and Gas.
Not really. Venezuela wouldn't add all that much supply to hydrocarbon markets in the short term to affect oil prices, and by now, USA is close to being energy self-sufficient, especially given recent domestic political changes.
the can defeat a drug issue they are aware of
We couldn't even do it in Mexico despite working with Mexican governments that were directly willing to ally with USA on the issue. What's the evidence we can do so in Venezuela?