I think there are more people these days who aren't considerate of others.
There's an increasing number of inconsiderate people in our world these days.
この場合、次のような言い方ができますよ。
ーI think there are more people these days who aren't considerate of others.
「他人に配慮できない人が最近増えてきていると思う」
there are more people who ... で「…な人が増えてきている」と言えます。
people who aren't considerate of others で「他人に配慮できない人」
ーThere's an increasing number of inconsiderate people in our world these days.
「最近世の中に思いやりのない人が増えてきている」
There's an increasing number of ... people で「…な人が増えてきている」
inconsiderate people で「他人に対して思いやりのない人」
ご参考まで！
The number of inconsiderate people has been increasing lately.
There's been more people being inconsiderate of others lately.
「最近は他人のことを配慮できない人が増えている。」は英語で「The number of inconsiderate people has been increasing lately.」と言います。また、「There's been more people being inconsiderate of others lately.」も大体同じ意味なのでどちらでも使えます。強いて言えば「There's been more...」の方がより自然だと聞こえますが、両方は普通に通じます。
最近は他人のことを配慮できない人が増えているからあまり人と関わりたくない。
The number of inconsiderate people has been increasing lately, so I don't really want to interact with others.
カナダ 
